问答题

Fit at Any Size Nikki Blonsky is exactly the role model most parents dream of for their kids. She"s happy, she"s successful, she"s overcome obstacles—no wonder her young fans adore her. She"s also overweight— by some measures very overweight—in a culture that fetishizes thin. (41)Blonsky is such a lucky dog, because she wouldn"t have been a popular figure she had been born a decade earlier. (42)Happiness might be the most difficult word to define, but at least people are increasingly aware of the fact that the body shape does not determine happiness. (43)Nobody likes to be over-weighted, yet it"s not our right to make the decision. (44)Before you let your kids to lose weight, you should make sure what they are losing, weight or health. (45)I{ you only feel hungry, then you can freely enjoy the joy of eating and drinking; however, if you bear the word "weight" in your mind, you can"t do that. Amid all this back-and-forth, however, there is one point that everyone agrees on: exercise definitely improves a child"s overall sense of well-being. Cooper, who invented aerobics a generation ago, has been testing the physical fitness of schoolchildren over the past decade and has consistently found that active kids do better academically, have fewer disciplinary issues and maintain better medical histories. "A child doesn"t need to be a star athlete or a tong-distance runner," Cooper says. "Even taking the stairs instead of an elevator has positive effects. " [A] There"s little doubt that being obese puts inactive youngsters at a higher risk for several health conditions, including Type 2 diabetes, high blood pressure and heart disease. But almost no studies have been done evaluating the pros and cons of kids being fat yet active. Plus, reports on adults in similar situations have conflicted. Since the 1970s, doctors at the nonprofit Cooper Institute in Dallas have gathered data from more than 100,000 patients who have been weighed, measured and made to run on treadmills while their vital signs are monitored. "We"ve long concluded that people who are overweight and active can be healthier than those who are thin but sedentary", says Dr. Kenneth Cooper, the institute"s director. "There"s no reason to believe that conclusion doesn"t apply to our children too. " [B] Behind the push to get kids fit is the growing recognition that, in many cases, there"s just no fighting the natural rhythms or shape of a child"s body. Throughout childhood and adolescence, hormones may cause weight to fluctuate dramatically. Plus, nature determines whether we"re all going to be stocky, a beanpole or something in between before we"re even born. "Most body weights and types for children and adults are genetically determined", says Glenn Gaesser, a professor of exercise physiology at the University of Virginia. "There are a lot of kids who are just naturally heavier than their peers but may be even healthier. " [C] Difficult as it is to hear that your child is overweight, placing a child on an enforced diet may do more long-term harm than good. Doctors have yet to find a weight-loss program that has proved universally effective and safe, especially for children. More often, dieters will lose weight in the short run only to regain it. Research suggests that the repeated losing-regaining cycle can lead to loss in bone density and lean muscle mass, organs and bones, jeopardizing overall health. In fact, at least 15 major studies have shown higher death rates for adults after repeated losing regaining weight cycling. [D] Plus-size celebrities like Blonsky—or, for that matter, her Hairspray co-stars John Travolta (albeit in a latex fat suit) and Queen Latifah—are increasingly spreading the message that slim is not the last word in happy. Fit means happy too; so does staying active; so does loving your body no matter its shape. The key is to get that body healthy and keep it that way. The numbers on the scale—pediatricians, nutritionists and psychologists now argue—should start to come second to physical fitness as a gauge for health. [E] As many as 10 million women and 1 million men in the U. S. suffer from an eating disorder, according to the National Eating Disorder Association (NEDA). Nearly 90% of those afflicted are under the age of 20, and females between the ages of 15 and 24 are 12 times as likely to die from anorexia as any one other cause of, death. A 2005 study published in the journal Pediatrics determined that of 10,000 teens surveyed, less than half of the males and about a third of the females were happy with their bodies. "Parents face a complicated situation", Tim Brownell, an expert from NEDA, says. "They have to promote healthy weight, but they also don"t want to change children into diet-crazed fanatics. " [F] There was a time when that alone would have been enough to keep Blonsky, the 19-year-old star of the movie Hairspray, out of the fan magazines and off the posters decorating grade-schoolers" bedroom walls. But that time may at last be ending. The national obesity epidemic did not happen in a vacuum. It occurred in an era in which fashion models have got thinner and thinner, the tolerance for even a little flab has grown lower and lower, and the rates of eating disorders like anorexia have climbed higher and higher. In that environment, children and adolescents trying to develop a healthy body image have almost no chance at all.

答案: 正确答案:B
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It"s not only humans that flourish in large settlements. Some ants find urban life so accommodating that their populations explode and they form supercolonies in cities. "One of the most common house ant species might have been built for living in some of the smallest spaces in a forest, but the ants have found ways to take advantage of the comforts of city living," Purdue University said in a statement. Grzegorz Buczkowski, a Purdue University research assistant professor of entomology, discovered odorous house ants live in supercolonies, creating complex networks entomologists have never seen with the species before now. He found that odorous house ant colonies become larger and more complex as they move from forest to city and act somewhat like an invasive species, the university said. "The ants live about 50 to a colony with one queen in forest settings but explode into supercolonies with more than 6 million workers and 50 000 queens in urban areas," the university explained. "This is a native species that"s doing this," said Buczkowski, whose results are published in the early online version of the journal Biological Invasions. "Native ants are not supposed to become invasive. We don"t know of any other native ants that are outcompeting other species of native ants like these," Buczkowski said. Odorous house ants live in hollow acorn shells in the forest. They"re called odorous because they have a coconut (椰子)-or rum-like smell when crushed. They"re considered one of the most common house ants, Purdue said. In semi-natural areas that are a cross of forest and urban areas, such as a park, Buczkowski said he observed colonies of about 500 workers with a single queen. "It"s possible that as the ants get closer to urban areas they have easier access to food, shelter and other resources," he said. "In the forest, they have to compete for food and nesting sites," Buczkowski said. "In the cities, they don"t have that competition. People give them a place to nest, food to eat. " Buczkowski observed the ants in three different settings on and around the Purdue campus. He said it might be expected that if the odorous house ants were able to multiply into complex colonies, other ants would do the same. But Buczkowski found no evidence that other ants had adapted to new environments and evolved into larger groups as the odorous house ants have, Purdie said. "It"s possible that odorous house ants are better adapted to city environments than other ant species or that they had somehow outcompeted or dominated other species," he said. "This raises a lot of questions we"d like to answer. " Buczkowski said understanding why the supercolonies form could lead to better control of the pests in homes, as well as ensuring that they don"t outcompete beneficial species. Future studies on odorous house ants will include studying the ant"s genetics and trying to understand the effects of urbanization of odorous house ants, Purdue said.The word "accommodating" (Line 1, Paragraph 1) is closest in meaning to " ______".

A.helpful
B.easy-going
C.spacious
D.easy to adapt to (a new place)
单项选择题

When is an endangered species not an endangered species When it lives in the sea, apparently. Despite continuing carnage in the ocean, marine creatures were refused any protection at the United Nations conference on trade in wildlife that ended yesterday in Doha, Qatar. Tigers, rhinos and elephants are all better protected after the meeting of the Convention on International Trade in Endangered Species (Cites). But hammerhead sharks, bluefin tuna and other marine species should be quaking in their skins. For when it comes to fish, the world has decided that scientific evidence of imminent demise is not reason enough to defend them against overexploitation. The conflict between trade and conservation is nothing new, but it is pretty well established that if you let trade in wildlife run rampant (蔓延的), soon there will be nothing left to sell. That is why the UN set up Cites in the first place. So why did fish get such a raw deal Is it that we care less about life that is so very different from us Do the emotionless eyes of fish leave our hearts cold Is it an extension of the convenient myth that fish feel no pain The truth is far more shocking. All fingers of blame point directly at Japan. The high value of bluefin tuna--a single specimen can reach $112 000--led it to orchestrate a full-scale campaign against proposals to ban trade in the species. Diplomatic missions were sent to developing nations to bully them into agreeing with Japan"s conviction that fish cannot be endangered. That way of thinking is grounded in ignorance. The oceans long seemed infinite in their capacity to produce such riches, and any sign that this was not so was hidden by our inability to peer into the depths. Science has now stripped back the veil and revealed the extent of the depletion. It is this science that Japan and its allies have chosen to not to see. Unfortunately for life in the sea, Japan"s campaign made waves far beyond the bluefin. Sharks are in dire trouble thanks to some people"s appetite for using their fins in soup. About 73 million sharks are killed each year as a result, and sharks don"t reproduce fast. But far from favoring a ban, nations voted against even the most basic monitoring of the trade. Red and pink corals have now all but vanished from the Mediterranean and are being stripped from the Pacific, but proposals to control that trade were also swept away. Fish don"t recognise borders and boundaries. Yet one nation, Japan, by its cynical use of political power is robbing the world of a shared resource.The word "carnage" (Line 2, Paragraph 1) is closest in meaning to " ______ ".

A.slaughter
B.protection
C.attention
D.neglect
单项选择题

It"s seven weeks into the new year. Do you know where your resolution is If you"re like millions of Americans, you probably vowed to lose weight, quit smoking and drink less in the new year. You kicked off January with a commitment to long-term well-being--until you came face-to-face with a cheeseburger. You spent a bundle on a shiny new gym pass. Turns out, it wasn"t reason enough for you to actually use the gym. People can make poor decisions when it comes to health--despite their best intentions. It"s not easy abiding by wholesome choices (giving up French fries) when the consequences of not doing so (heart disease) seem so far in the future. Most people are bad at judging their health risks: smokers generally know cigarettes cause cancer, but they also tend to believe they"re less likely than other smokers to get it. And as any snack-loving dieter can attest, people can be comically inept at predicting their future .behavior. You swear you will eat just one potato chip but don"t stop until the bag is empty. So, what does it take to motivate people to stick to the path set by their conscious brain How can good choices be made to seem more appealing than bad ones The problem stumps doctors, public-health officials and weight-loss experts, but one solution may spring from an unlikely source. Meet your new personal trainer: your boss. American businesses have a particular interest in personal health, since worker illness costs them billions each year in insurance claims, sick days and high staff turnover. A 2008 survey of major US employers found that 64% consider their employees" poor health decisions a serious barrier to affordable insurance coverage. Now some companies are tackling the motivation problem head on, using tactics drawn from behavioral psychology to nudge their employees to get healthy. "It"s a bit paradoxical that employers need to provide incentives for people to improve their own health," says Michael Follick, a behavioral psychologist at Brown University and president of the consultancy Abacus Employer Health Solutions. Paradoxical, maybe, but effective. Consider Amica Mutual Insurance, based in Rhode Island. Arnica seemed to be doing everything right: it boasts an on-site fitness center at its headquarters. It pays toward Weight Watchers and smoking-cessation help, gives gift cards to reward proper prenatal care and offers free flu shots each year. Still, in the mid-2000s, about 7% of the company"s insured population, including roughly 3 100 employees and their dependents, had diabetes. "We manage risk. That"s our core business," says Scott Boyd, Amica"s director of compensation and benefits. But diabetes-related claims from Arnica employees had doubled in four years. "We thought, OK," Boyd says now, "we have to manage these high-risk groups a little better. "In the first paragraph, we can infer that the Americans ______.

A.vow to diet in the new year
B.fear to lose weight
C.have poor decision in keeping healthy diet
D.succeed in losing weight
单项选择题

Computer brain games may not offer the big mental boost many were hoping for, suggests new research, but brain scientists and brain-game experts don"t all agree on the findings. The study, out this week in Nature, is the largest of its kind, say scientists from England"s Medical Research Council Cognition and Brain Sciences Unit and the Alzheimer"s Society, UK. They said in a Tuesday press briefing that brain-training games, used by millions, may not increase general brain power on other tasks or increase IQ "Participants did get better at games they practiced. The more they trained, the better they got. But there was still no translation to any general improvement in cognitive function," said lead author Adrian Owen, assistant director of Medical Research Council. The online experiment was sponsored by the BBC and involved more than 11 000 people between the ages of 18 and 60. They were split into three groups, including two groups that played different brain-training games that are similar to commercially available games, and a control group that was asked to go online and find answers to questions about topics such as music. Participants trained for at least 10 minutes a day, three times a week, for up to six weeks, Owen said. All took standard cognitive assessment tests at the start and finish of the study. While players increased their skills the more they played a specific game, that improvement didn"t transfer to other activities or to a higher score on intelligence tests, said Owen and colleagues. Duke psychiatrist and Alzheimer"s expert Murali Doraiswamy said it"s the best study done to date and a good reality check. "There was so much hype surrounding brain games," he said. But it"s not a death knell for gaming, Doraiswamy said. "I still think brain games offer tremendous potential for helping people with conditions such as ADHD and learning disabilities, but this study puts the burden of proof now on game manufacturers to show that they really offer meaningful benefits. " Study shortcomings include the fact that it didn"t focus on the aging population, a group targeted by brain-game makers, experts said. And it did not look at benefits of more intense training, said Alvaro Fernandez, CEO and cofounder of Sharp Brains, a San Francisco market research firm that specializes in cognitive science. "This study shows random brain exercise doesn"t transfer, but it does not deny that transfer can work if a person engages in more intense and targeted brain-training," Fernandez said.According to Adrian Owen, the function of brain-training games is that ______.

A.they can make general brain powerful
B.they may offer the big mental boost
C.they can transfer to improvement in cognitive function
D.they have nothing to do with improving cognitive function
问答题

Fit at Any Size Nikki Blonsky is exactly the role model most parents dream of for their kids. She"s happy, she"s successful, she"s overcome obstacles—no wonder her young fans adore her. She"s also overweight— by some measures very overweight—in a culture that fetishizes thin. (41)Blonsky is such a lucky dog, because she wouldn"t have been a popular figure she had been born a decade earlier. (42)Happiness might be the most difficult word to define, but at least people are increasingly aware of the fact that the body shape does not determine happiness. (43)Nobody likes to be over-weighted, yet it"s not our right to make the decision. (44)Before you let your kids to lose weight, you should make sure what they are losing, weight or health. (45)I{ you only feel hungry, then you can freely enjoy the joy of eating and drinking; however, if you bear the word "weight" in your mind, you can"t do that. Amid all this back-and-forth, however, there is one point that everyone agrees on: exercise definitely improves a child"s overall sense of well-being. Cooper, who invented aerobics a generation ago, has been testing the physical fitness of schoolchildren over the past decade and has consistently found that active kids do better academically, have fewer disciplinary issues and maintain better medical histories. "A child doesn"t need to be a star athlete or a tong-distance runner," Cooper says. "Even taking the stairs instead of an elevator has positive effects. " [A] There"s little doubt that being obese puts inactive youngsters at a higher risk for several health conditions, including Type 2 diabetes, high blood pressure and heart disease. But almost no studies have been done evaluating the pros and cons of kids being fat yet active. Plus, reports on adults in similar situations have conflicted. Since the 1970s, doctors at the nonprofit Cooper Institute in Dallas have gathered data from more than 100,000 patients who have been weighed, measured and made to run on treadmills while their vital signs are monitored. "We"ve long concluded that people who are overweight and active can be healthier than those who are thin but sedentary", says Dr. Kenneth Cooper, the institute"s director. "There"s no reason to believe that conclusion doesn"t apply to our children too. " [B] Behind the push to get kids fit is the growing recognition that, in many cases, there"s just no fighting the natural rhythms or shape of a child"s body. Throughout childhood and adolescence, hormones may cause weight to fluctuate dramatically. Plus, nature determines whether we"re all going to be stocky, a beanpole or something in between before we"re even born. "Most body weights and types for children and adults are genetically determined", says Glenn Gaesser, a professor of exercise physiology at the University of Virginia. "There are a lot of kids who are just naturally heavier than their peers but may be even healthier. " [C] Difficult as it is to hear that your child is overweight, placing a child on an enforced diet may do more long-term harm than good. Doctors have yet to find a weight-loss program that has proved universally effective and safe, especially for children. More often, dieters will lose weight in the short run only to regain it. Research suggests that the repeated losing-regaining cycle can lead to loss in bone density and lean muscle mass, organs and bones, jeopardizing overall health. In fact, at least 15 major studies have shown higher death rates for adults after repeated losing regaining weight cycling. [D] Plus-size celebrities like Blonsky—or, for that matter, her Hairspray co-stars John Travolta (albeit in a latex fat suit) and Queen Latifah—are increasingly spreading the message that slim is not the last word in happy. Fit means happy too; so does staying active; so does loving your body no matter its shape. The key is to get that body healthy and keep it that way. The numbers on the scale—pediatricians, nutritionists and psychologists now argue—should start to come second to physical fitness as a gauge for health. [E] As many as 10 million women and 1 million men in the U. S. suffer from an eating disorder, according to the National Eating Disorder Association (NEDA). Nearly 90% of those afflicted are under the age of 20, and females between the ages of 15 and 24 are 12 times as likely to die from anorexia as any one other cause of, death. A 2005 study published in the journal Pediatrics determined that of 10,000 teens surveyed, less than half of the males and about a third of the females were happy with their bodies. "Parents face a complicated situation", Tim Brownell, an expert from NEDA, says. "They have to promote healthy weight, but they also don"t want to change children into diet-crazed fanatics. " [F] There was a time when that alone would have been enough to keep Blonsky, the 19-year-old star of the movie Hairspray, out of the fan magazines and off the posters decorating grade-schoolers" bedroom walls. But that time may at last be ending. The national obesity epidemic did not happen in a vacuum. It occurred in an era in which fashion models have got thinner and thinner, the tolerance for even a little flab has grown lower and lower, and the rates of eating disorders like anorexia have climbed higher and higher. In that environment, children and adolescents trying to develop a healthy body image have almost no chance at all.

答案: 正确答案:F
单项选择题

It"s not only humans that flourish in large settlements. Some ants find urban life so accommodating that their populations explode and they form supercolonies in cities. "One of the most common house ant species might have been built for living in some of the smallest spaces in a forest, but the ants have found ways to take advantage of the comforts of city living," Purdue University said in a statement. Grzegorz Buczkowski, a Purdue University research assistant professor of entomology, discovered odorous house ants live in supercolonies, creating complex networks entomologists have never seen with the species before now. He found that odorous house ant colonies become larger and more complex as they move from forest to city and act somewhat like an invasive species, the university said. "The ants live about 50 to a colony with one queen in forest settings but explode into supercolonies with more than 6 million workers and 50 000 queens in urban areas," the university explained. "This is a native species that"s doing this," said Buczkowski, whose results are published in the early online version of the journal Biological Invasions. "Native ants are not supposed to become invasive. We don"t know of any other native ants that are outcompeting other species of native ants like these," Buczkowski said. Odorous house ants live in hollow acorn shells in the forest. They"re called odorous because they have a coconut (椰子)-or rum-like smell when crushed. They"re considered one of the most common house ants, Purdue said. In semi-natural areas that are a cross of forest and urban areas, such as a park, Buczkowski said he observed colonies of about 500 workers with a single queen. "It"s possible that as the ants get closer to urban areas they have easier access to food, shelter and other resources," he said. "In the forest, they have to compete for food and nesting sites," Buczkowski said. "In the cities, they don"t have that competition. People give them a place to nest, food to eat. " Buczkowski observed the ants in three different settings on and around the Purdue campus. He said it might be expected that if the odorous house ants were able to multiply into complex colonies, other ants would do the same. But Buczkowski found no evidence that other ants had adapted to new environments and evolved into larger groups as the odorous house ants have, Purdie said. "It"s possible that odorous house ants are better adapted to city environments than other ant species or that they had somehow outcompeted or dominated other species," he said. "This raises a lot of questions we"d like to answer. " Buczkowski said understanding why the supercolonies form could lead to better control of the pests in homes, as well as ensuring that they don"t outcompete beneficial species. Future studies on odorous house ants will include studying the ant"s genetics and trying to understand the effects of urbanization of odorous house ants, Purdue said.According to the third paragraph, native ants are ______.

A.liable to become aggressive
B.not prone to be offensive
C.able to outcompete other ants
D.easily attacked by other ants
单项选择题

When is an endangered species not an endangered species When it lives in the sea, apparently. Despite continuing carnage in the ocean, marine creatures were refused any protection at the United Nations conference on trade in wildlife that ended yesterday in Doha, Qatar. Tigers, rhinos and elephants are all better protected after the meeting of the Convention on International Trade in Endangered Species (Cites). But hammerhead sharks, bluefin tuna and other marine species should be quaking in their skins. For when it comes to fish, the world has decided that scientific evidence of imminent demise is not reason enough to defend them against overexploitation. The conflict between trade and conservation is nothing new, but it is pretty well established that if you let trade in wildlife run rampant (蔓延的), soon there will be nothing left to sell. That is why the UN set up Cites in the first place. So why did fish get such a raw deal Is it that we care less about life that is so very different from us Do the emotionless eyes of fish leave our hearts cold Is it an extension of the convenient myth that fish feel no pain The truth is far more shocking. All fingers of blame point directly at Japan. The high value of bluefin tuna--a single specimen can reach $112 000--led it to orchestrate a full-scale campaign against proposals to ban trade in the species. Diplomatic missions were sent to developing nations to bully them into agreeing with Japan"s conviction that fish cannot be endangered. That way of thinking is grounded in ignorance. The oceans long seemed infinite in their capacity to produce such riches, and any sign that this was not so was hidden by our inability to peer into the depths. Science has now stripped back the veil and revealed the extent of the depletion. It is this science that Japan and its allies have chosen to not to see. Unfortunately for life in the sea, Japan"s campaign made waves far beyond the bluefin. Sharks are in dire trouble thanks to some people"s appetite for using their fins in soup. About 73 million sharks are killed each year as a result, and sharks don"t reproduce fast. But far from favoring a ban, nations voted against even the most basic monitoring of the trade. Red and pink corals have now all but vanished from the Mediterranean and are being stripped from the Pacific, but proposals to control that trade were also swept away. Fish don"t recognise borders and boundaries. Yet one nation, Japan, by its cynical use of political power is robbing the world of a shared resource.The conflict between trade and conservation is______.

A.the establishment of Cites
B.the urgency of protecting marine creatures
C.the divergence on the trade of fish
D.the value of fish
单项选择题

It"s seven weeks into the new year. Do you know where your resolution is If you"re like millions of Americans, you probably vowed to lose weight, quit smoking and drink less in the new year. You kicked off January with a commitment to long-term well-being--until you came face-to-face with a cheeseburger. You spent a bundle on a shiny new gym pass. Turns out, it wasn"t reason enough for you to actually use the gym. People can make poor decisions when it comes to health--despite their best intentions. It"s not easy abiding by wholesome choices (giving up French fries) when the consequences of not doing so (heart disease) seem so far in the future. Most people are bad at judging their health risks: smokers generally know cigarettes cause cancer, but they also tend to believe they"re less likely than other smokers to get it. And as any snack-loving dieter can attest, people can be comically inept at predicting their future .behavior. You swear you will eat just one potato chip but don"t stop until the bag is empty. So, what does it take to motivate people to stick to the path set by their conscious brain How can good choices be made to seem more appealing than bad ones The problem stumps doctors, public-health officials and weight-loss experts, but one solution may spring from an unlikely source. Meet your new personal trainer: your boss. American businesses have a particular interest in personal health, since worker illness costs them billions each year in insurance claims, sick days and high staff turnover. A 2008 survey of major US employers found that 64% consider their employees" poor health decisions a serious barrier to affordable insurance coverage. Now some companies are tackling the motivation problem head on, using tactics drawn from behavioral psychology to nudge their employees to get healthy. "It"s a bit paradoxical that employers need to provide incentives for people to improve their own health," says Michael Follick, a behavioral psychologist at Brown University and president of the consultancy Abacus Employer Health Solutions. Paradoxical, maybe, but effective. Consider Amica Mutual Insurance, based in Rhode Island. Arnica seemed to be doing everything right: it boasts an on-site fitness center at its headquarters. It pays toward Weight Watchers and smoking-cessation help, gives gift cards to reward proper prenatal care and offers free flu shots each year. Still, in the mid-2000s, about 7% of the company"s insured population, including roughly 3 100 employees and their dependents, had diabetes. "We manage risk. That"s our core business," says Scott Boyd, Amica"s director of compensation and benefits. But diabetes-related claims from Arnica employees had doubled in four years. "We thought, OK," Boyd says now, "we have to manage these high-risk groups a little better. "Why can people make poor decision when it comes to health

A.Because they have no intention of being healthy.
B.Because they are bad at judging their health risks.
C.Because it is not easy abiding by impractical commitments.
D.Because they can not resist the temptation of delicious food.
单项选择题

Computer brain games may not offer the big mental boost many were hoping for, suggests new research, but brain scientists and brain-game experts don"t all agree on the findings. The study, out this week in Nature, is the largest of its kind, say scientists from England"s Medical Research Council Cognition and Brain Sciences Unit and the Alzheimer"s Society, UK. They said in a Tuesday press briefing that brain-training games, used by millions, may not increase general brain power on other tasks or increase IQ "Participants did get better at games they practiced. The more they trained, the better they got. But there was still no translation to any general improvement in cognitive function," said lead author Adrian Owen, assistant director of Medical Research Council. The online experiment was sponsored by the BBC and involved more than 11 000 people between the ages of 18 and 60. They were split into three groups, including two groups that played different brain-training games that are similar to commercially available games, and a control group that was asked to go online and find answers to questions about topics such as music. Participants trained for at least 10 minutes a day, three times a week, for up to six weeks, Owen said. All took standard cognitive assessment tests at the start and finish of the study. While players increased their skills the more they played a specific game, that improvement didn"t transfer to other activities or to a higher score on intelligence tests, said Owen and colleagues. Duke psychiatrist and Alzheimer"s expert Murali Doraiswamy said it"s the best study done to date and a good reality check. "There was so much hype surrounding brain games," he said. But it"s not a death knell for gaming, Doraiswamy said. "I still think brain games offer tremendous potential for helping people with conditions such as ADHD and learning disabilities, but this study puts the burden of proof now on game manufacturers to show that they really offer meaningful benefits. " Study shortcomings include the fact that it didn"t focus on the aging population, a group targeted by brain-game makers, experts said. And it did not look at benefits of more intense training, said Alvaro Fernandez, CEO and cofounder of Sharp Brains, a San Francisco market research firm that specializes in cognitive science. "This study shows random brain exercise doesn"t transfer, but it does not deny that transfer can work if a person engages in more intense and targeted brain-training," Fernandez said.The result of the online experiment is that the people involved ______.

A.improved their cognitive function
B.did not increase their skills in games
C.increased the skills in playing games but did not improve IQ
D.had no improvement in playing games and intelligence tests
单项选择题

When is an endangered species not an endangered species When it lives in the sea, apparently. Despite continuing carnage in the ocean, marine creatures were refused any protection at the United Nations conference on trade in wildlife that ended yesterday in Doha, Qatar. Tigers, rhinos and elephants are all better protected after the meeting of the Convention on International Trade in Endangered Species (Cites). But hammerhead sharks, bluefin tuna and other marine species should be quaking in their skins. For when it comes to fish, the world has decided that scientific evidence of imminent demise is not reason enough to defend them against overexploitation. The conflict between trade and conservation is nothing new, but it is pretty well established that if you let trade in wildlife run rampant (蔓延的), soon there will be nothing left to sell. That is why the UN set up Cites in the first place. So why did fish get such a raw deal Is it that we care less about life that is so very different from us Do the emotionless eyes of fish leave our hearts cold Is it an extension of the convenient myth that fish feel no pain The truth is far more shocking. All fingers of blame point directly at Japan. The high value of bluefin tuna--a single specimen can reach $112 000--led it to orchestrate a full-scale campaign against proposals to ban trade in the species. Diplomatic missions were sent to developing nations to bully them into agreeing with Japan"s conviction that fish cannot be endangered. That way of thinking is grounded in ignorance. The oceans long seemed infinite in their capacity to produce such riches, and any sign that this was not so was hidden by our inability to peer into the depths. Science has now stripped back the veil and revealed the extent of the depletion. It is this science that Japan and its allies have chosen to not to see. Unfortunately for life in the sea, Japan"s campaign made waves far beyond the bluefin. Sharks are in dire trouble thanks to some people"s appetite for using their fins in soup. About 73 million sharks are killed each year as a result, and sharks don"t reproduce fast. But far from favoring a ban, nations voted against even the most basic monitoring of the trade. Red and pink corals have now all but vanished from the Mediterranean and are being stripped from the Pacific, but proposals to control that trade were also swept away. Fish don"t recognise borders and boundaries. Yet one nation, Japan, by its cynical use of political power is robbing the world of a shared resource.Why are fish refused any protection from the United Nations conference

A.We care less about marine life.
B.The emotionless eyes of fish leave our hearts cold.
C.People think that fish feel no pain.
D.People especially Japanese convict that fish won"t be endangered.
单项选择题

It"s not only humans that flourish in large settlements. Some ants find urban life so accommodating that their populations explode and they form supercolonies in cities. "One of the most common house ant species might have been built for living in some of the smallest spaces in a forest, but the ants have found ways to take advantage of the comforts of city living," Purdue University said in a statement. Grzegorz Buczkowski, a Purdue University research assistant professor of entomology, discovered odorous house ants live in supercolonies, creating complex networks entomologists have never seen with the species before now. He found that odorous house ant colonies become larger and more complex as they move from forest to city and act somewhat like an invasive species, the university said. "The ants live about 50 to a colony with one queen in forest settings but explode into supercolonies with more than 6 million workers and 50 000 queens in urban areas," the university explained. "This is a native species that"s doing this," said Buczkowski, whose results are published in the early online version of the journal Biological Invasions. "Native ants are not supposed to become invasive. We don"t know of any other native ants that are outcompeting other species of native ants like these," Buczkowski said. Odorous house ants live in hollow acorn shells in the forest. They"re called odorous because they have a coconut (椰子)-or rum-like smell when crushed. They"re considered one of the most common house ants, Purdue said. In semi-natural areas that are a cross of forest and urban areas, such as a park, Buczkowski said he observed colonies of about 500 workers with a single queen. "It"s possible that as the ants get closer to urban areas they have easier access to food, shelter and other resources," he said. "In the forest, they have to compete for food and nesting sites," Buczkowski said. "In the cities, they don"t have that competition. People give them a place to nest, food to eat. " Buczkowski observed the ants in three different settings on and around the Purdue campus. He said it might be expected that if the odorous house ants were able to multiply into complex colonies, other ants would do the same. But Buczkowski found no evidence that other ants had adapted to new environments and evolved into larger groups as the odorous house ants have, Purdie said. "It"s possible that odorous house ants are better adapted to city environments than other ant species or that they had somehow outcompeted or dominated other species," he said. "This raises a lot of questions we"d like to answer. " Buczkowski said understanding why the supercolonies form could lead to better control of the pests in homes, as well as ensuring that they don"t outcompete beneficial species. Future studies on odorous house ants will include studying the ant"s genetics and trying to understand the effects of urbanization of odorous house ants, Purdue said.The semi-natural areas don"t include______.

A.grass lands on campus
B.forests
C.parks
D.greenbelts
问答题

Fit at Any Size Nikki Blonsky is exactly the role model most parents dream of for their kids. She"s happy, she"s successful, she"s overcome obstacles—no wonder her young fans adore her. She"s also overweight— by some measures very overweight—in a culture that fetishizes thin. (41)Blonsky is such a lucky dog, because she wouldn"t have been a popular figure she had been born a decade earlier. (42)Happiness might be the most difficult word to define, but at least people are increasingly aware of the fact that the body shape does not determine happiness. (43)Nobody likes to be over-weighted, yet it"s not our right to make the decision. (44)Before you let your kids to lose weight, you should make sure what they are losing, weight or health. (45)I{ you only feel hungry, then you can freely enjoy the joy of eating and drinking; however, if you bear the word "weight" in your mind, you can"t do that. Amid all this back-and-forth, however, there is one point that everyone agrees on: exercise definitely improves a child"s overall sense of well-being. Cooper, who invented aerobics a generation ago, has been testing the physical fitness of schoolchildren over the past decade and has consistently found that active kids do better academically, have fewer disciplinary issues and maintain better medical histories. "A child doesn"t need to be a star athlete or a tong-distance runner," Cooper says. "Even taking the stairs instead of an elevator has positive effects. " [A] There"s little doubt that being obese puts inactive youngsters at a higher risk for several health conditions, including Type 2 diabetes, high blood pressure and heart disease. But almost no studies have been done evaluating the pros and cons of kids being fat yet active. Plus, reports on adults in similar situations have conflicted. Since the 1970s, doctors at the nonprofit Cooper Institute in Dallas have gathered data from more than 100,000 patients who have been weighed, measured and made to run on treadmills while their vital signs are monitored. "We"ve long concluded that people who are overweight and active can be healthier than those who are thin but sedentary", says Dr. Kenneth Cooper, the institute"s director. "There"s no reason to believe that conclusion doesn"t apply to our children too. " [B] Behind the push to get kids fit is the growing recognition that, in many cases, there"s just no fighting the natural rhythms or shape of a child"s body. Throughout childhood and adolescence, hormones may cause weight to fluctuate dramatically. Plus, nature determines whether we"re all going to be stocky, a beanpole or something in between before we"re even born. "Most body weights and types for children and adults are genetically determined", says Glenn Gaesser, a professor of exercise physiology at the University of Virginia. "There are a lot of kids who are just naturally heavier than their peers but may be even healthier. " [C] Difficult as it is to hear that your child is overweight, placing a child on an enforced diet may do more long-term harm than good. Doctors have yet to find a weight-loss program that has proved universally effective and safe, especially for children. More often, dieters will lose weight in the short run only to regain it. Research suggests that the repeated losing-regaining cycle can lead to loss in bone density and lean muscle mass, organs and bones, jeopardizing overall health. In fact, at least 15 major studies have shown higher death rates for adults after repeated losing regaining weight cycling. [D] Plus-size celebrities like Blonsky—or, for that matter, her Hairspray co-stars John Travolta (albeit in a latex fat suit) and Queen Latifah—are increasingly spreading the message that slim is not the last word in happy. Fit means happy too; so does staying active; so does loving your body no matter its shape. The key is to get that body healthy and keep it that way. The numbers on the scale—pediatricians, nutritionists and psychologists now argue—should start to come second to physical fitness as a gauge for health. [E] As many as 10 million women and 1 million men in the U. S. suffer from an eating disorder, according to the National Eating Disorder Association (NEDA). Nearly 90% of those afflicted are under the age of 20, and females between the ages of 15 and 24 are 12 times as likely to die from anorexia as any one other cause of, death. A 2005 study published in the journal Pediatrics determined that of 10,000 teens surveyed, less than half of the males and about a third of the females were happy with their bodies. "Parents face a complicated situation", Tim Brownell, an expert from NEDA, says. "They have to promote healthy weight, but they also don"t want to change children into diet-crazed fanatics. " [F] There was a time when that alone would have been enough to keep Blonsky, the 19-year-old star of the movie Hairspray, out of the fan magazines and off the posters decorating grade-schoolers" bedroom walls. But that time may at last be ending. The national obesity epidemic did not happen in a vacuum. It occurred in an era in which fashion models have got thinner and thinner, the tolerance for even a little flab has grown lower and lower, and the rates of eating disorders like anorexia have climbed higher and higher. In that environment, children and adolescents trying to develop a healthy body image have almost no chance at all.

答案: 正确答案:D
单项选择题

Computer brain games may not offer the big mental boost many were hoping for, suggests new research, but brain scientists and brain-game experts don"t all agree on the findings. The study, out this week in Nature, is the largest of its kind, say scientists from England"s Medical Research Council Cognition and Brain Sciences Unit and the Alzheimer"s Society, UK. They said in a Tuesday press briefing that brain-training games, used by millions, may not increase general brain power on other tasks or increase IQ "Participants did get better at games they practiced. The more they trained, the better they got. But there was still no translation to any general improvement in cognitive function," said lead author Adrian Owen, assistant director of Medical Research Council. The online experiment was sponsored by the BBC and involved more than 11 000 people between the ages of 18 and 60. They were split into three groups, including two groups that played different brain-training games that are similar to commercially available games, and a control group that was asked to go online and find answers to questions about topics such as music. Participants trained for at least 10 minutes a day, three times a week, for up to six weeks, Owen said. All took standard cognitive assessment tests at the start and finish of the study. While players increased their skills the more they played a specific game, that improvement didn"t transfer to other activities or to a higher score on intelligence tests, said Owen and colleagues. Duke psychiatrist and Alzheimer"s expert Murali Doraiswamy said it"s the best study done to date and a good reality check. "There was so much hype surrounding brain games," he said. But it"s not a death knell for gaming, Doraiswamy said. "I still think brain games offer tremendous potential for helping people with conditions such as ADHD and learning disabilities, but this study puts the burden of proof now on game manufacturers to show that they really offer meaningful benefits. " Study shortcomings include the fact that it didn"t focus on the aging population, a group targeted by brain-game makers, experts said. And it did not look at benefits of more intense training, said Alvaro Fernandez, CEO and cofounder of Sharp Brains, a San Francisco market research firm that specializes in cognitive science. "This study shows random brain exercise doesn"t transfer, but it does not deny that transfer can work if a person engages in more intense and targeted brain-training," Fernandez said.Murali Doraiswamy holds that brain games ______.

A.are running rampant
B.will not exist any longer
C.offer game manufacturers benefits
D.help people to some extent
单项选择题

It"s seven weeks into the new year. Do you know where your resolution is If you"re like millions of Americans, you probably vowed to lose weight, quit smoking and drink less in the new year. You kicked off January with a commitment to long-term well-being--until you came face-to-face with a cheeseburger. You spent a bundle on a shiny new gym pass. Turns out, it wasn"t reason enough for you to actually use the gym. People can make poor decisions when it comes to health--despite their best intentions. It"s not easy abiding by wholesome choices (giving up French fries) when the consequences of not doing so (heart disease) seem so far in the future. Most people are bad at judging their health risks: smokers generally know cigarettes cause cancer, but they also tend to believe they"re less likely than other smokers to get it. And as any snack-loving dieter can attest, people can be comically inept at predicting their future .behavior. You swear you will eat just one potato chip but don"t stop until the bag is empty. So, what does it take to motivate people to stick to the path set by their conscious brain How can good choices be made to seem more appealing than bad ones The problem stumps doctors, public-health officials and weight-loss experts, but one solution may spring from an unlikely source. Meet your new personal trainer: your boss. American businesses have a particular interest in personal health, since worker illness costs them billions each year in insurance claims, sick days and high staff turnover. A 2008 survey of major US employers found that 64% consider their employees" poor health decisions a serious barrier to affordable insurance coverage. Now some companies are tackling the motivation problem head on, using tactics drawn from behavioral psychology to nudge their employees to get healthy. "It"s a bit paradoxical that employers need to provide incentives for people to improve their own health," says Michael Follick, a behavioral psychologist at Brown University and president of the consultancy Abacus Employer Health Solutions. Paradoxical, maybe, but effective. Consider Amica Mutual Insurance, based in Rhode Island. Arnica seemed to be doing everything right: it boasts an on-site fitness center at its headquarters. It pays toward Weight Watchers and smoking-cessation help, gives gift cards to reward proper prenatal care and offers free flu shots each year. Still, in the mid-2000s, about 7% of the company"s insured population, including roughly 3 100 employees and their dependents, had diabetes. "We manage risk. That"s our core business," says Scott Boyd, Amica"s director of compensation and benefits. But diabetes-related claims from Arnica employees had doubled in four years. "We thought, OK," Boyd says now, "we have to manage these high-risk groups a little better. "Who play an important role in motivating people to stick to health

A.Doctors.
B.Public-health officials.
C.Weight-loss experts.
D.Bosses.
单项选择题

When is an endangered species not an endangered species When it lives in the sea, apparently. Despite continuing carnage in the ocean, marine creatures were refused any protection at the United Nations conference on trade in wildlife that ended yesterday in Doha, Qatar. Tigers, rhinos and elephants are all better protected after the meeting of the Convention on International Trade in Endangered Species (Cites). But hammerhead sharks, bluefin tuna and other marine species should be quaking in their skins. For when it comes to fish, the world has decided that scientific evidence of imminent demise is not reason enough to defend them against overexploitation. The conflict between trade and conservation is nothing new, but it is pretty well established that if you let trade in wildlife run rampant (蔓延的), soon there will be nothing left to sell. That is why the UN set up Cites in the first place. So why did fish get such a raw deal Is it that we care less about life that is so very different from us Do the emotionless eyes of fish leave our hearts cold Is it an extension of the convenient myth that fish feel no pain The truth is far more shocking. All fingers of blame point directly at Japan. The high value of bluefin tuna--a single specimen can reach $112 000--led it to orchestrate a full-scale campaign against proposals to ban trade in the species. Diplomatic missions were sent to developing nations to bully them into agreeing with Japan"s conviction that fish cannot be endangered. That way of thinking is grounded in ignorance. The oceans long seemed infinite in their capacity to produce such riches, and any sign that this was not so was hidden by our inability to peer into the depths. Science has now stripped back the veil and revealed the extent of the depletion. It is this science that Japan and its allies have chosen to not to see. Unfortunately for life in the sea, Japan"s campaign made waves far beyond the bluefin. Sharks are in dire trouble thanks to some people"s appetite for using their fins in soup. About 73 million sharks are killed each year as a result, and sharks don"t reproduce fast. But far from favoring a ban, nations voted against even the most basic monitoring of the trade. Red and pink corals have now all but vanished from the Mediterranean and are being stripped from the Pacific, but proposals to control that trade were also swept away. Fish don"t recognise borders and boundaries. Yet one nation, Japan, by its cynical use of political power is robbing the world of a shared resource.Sharks are endangered mainly because ______.

A.Japanese believe that fish cannot be endangered
B.we don"t have effective measures to protect them
C.Chinese have a desire for their fins in the cooking
D.sharks don"t reproduce fast
单项选择题

It"s not only humans that flourish in large settlements. Some ants find urban life so accommodating that their populations explode and they form supercolonies in cities. "One of the most common house ant species might have been built for living in some of the smallest spaces in a forest, but the ants have found ways to take advantage of the comforts of city living," Purdue University said in a statement. Grzegorz Buczkowski, a Purdue University research assistant professor of entomology, discovered odorous house ants live in supercolonies, creating complex networks entomologists have never seen with the species before now. He found that odorous house ant colonies become larger and more complex as they move from forest to city and act somewhat like an invasive species, the university said. "The ants live about 50 to a colony with one queen in forest settings but explode into supercolonies with more than 6 million workers and 50 000 queens in urban areas," the university explained. "This is a native species that"s doing this," said Buczkowski, whose results are published in the early online version of the journal Biological Invasions. "Native ants are not supposed to become invasive. We don"t know of any other native ants that are outcompeting other species of native ants like these," Buczkowski said. Odorous house ants live in hollow acorn shells in the forest. They"re called odorous because they have a coconut (椰子)-or rum-like smell when crushed. They"re considered one of the most common house ants, Purdue said. In semi-natural areas that are a cross of forest and urban areas, such as a park, Buczkowski said he observed colonies of about 500 workers with a single queen. "It"s possible that as the ants get closer to urban areas they have easier access to food, shelter and other resources," he said. "In the forest, they have to compete for food and nesting sites," Buczkowski said. "In the cities, they don"t have that competition. People give them a place to nest, food to eat. " Buczkowski observed the ants in three different settings on and around the Purdue campus. He said it might be expected that if the odorous house ants were able to multiply into complex colonies, other ants would do the same. But Buczkowski found no evidence that other ants had adapted to new environments and evolved into larger groups as the odorous house ants have, Purdie said. "It"s possible that odorous house ants are better adapted to city environments than other ant species or that they had somehow outcompeted or dominated other species," he said. "This raises a lot of questions we"d like to answer. " Buczkowski said understanding why the supercolonies form could lead to better control of the pests in homes, as well as ensuring that they don"t outcompete beneficial species. Future studies on odorous house ants will include studying the ant"s genetics and trying to understand the effects of urbanization of odorous house ants, Purdue said.The purpose of understanding the supercolonies" forming is to ______.

A.control the pests and protect beneficial species
B.understand the effects of urbanization of ants
C.help study the ant"s genetics
D.better totally dominate other species
问答题

Fit at Any Size Nikki Blonsky is exactly the role model most parents dream of for their kids. She"s happy, she"s successful, she"s overcome obstacles—no wonder her young fans adore her. She"s also overweight— by some measures very overweight—in a culture that fetishizes thin. (41)Blonsky is such a lucky dog, because she wouldn"t have been a popular figure she had been born a decade earlier. (42)Happiness might be the most difficult word to define, but at least people are increasingly aware of the fact that the body shape does not determine happiness. (43)Nobody likes to be over-weighted, yet it"s not our right to make the decision. (44)Before you let your kids to lose weight, you should make sure what they are losing, weight or health. (45)I{ you only feel hungry, then you can freely enjoy the joy of eating and drinking; however, if you bear the word "weight" in your mind, you can"t do that. Amid all this back-and-forth, however, there is one point that everyone agrees on: exercise definitely improves a child"s overall sense of well-being. Cooper, who invented aerobics a generation ago, has been testing the physical fitness of schoolchildren over the past decade and has consistently found that active kids do better academically, have fewer disciplinary issues and maintain better medical histories. "A child doesn"t need to be a star athlete or a tong-distance runner," Cooper says. "Even taking the stairs instead of an elevator has positive effects. " [A] There"s little doubt that being obese puts inactive youngsters at a higher risk for several health conditions, including Type 2 diabetes, high blood pressure and heart disease. But almost no studies have been done evaluating the pros and cons of kids being fat yet active. Plus, reports on adults in similar situations have conflicted. Since the 1970s, doctors at the nonprofit Cooper Institute in Dallas have gathered data from more than 100,000 patients who have been weighed, measured and made to run on treadmills while their vital signs are monitored. "We"ve long concluded that people who are overweight and active can be healthier than those who are thin but sedentary", says Dr. Kenneth Cooper, the institute"s director. "There"s no reason to believe that conclusion doesn"t apply to our children too. " [B] Behind the push to get kids fit is the growing recognition that, in many cases, there"s just no fighting the natural rhythms or shape of a child"s body. Throughout childhood and adolescence, hormones may cause weight to fluctuate dramatically. Plus, nature determines whether we"re all going to be stocky, a beanpole or something in between before we"re even born. "Most body weights and types for children and adults are genetically determined", says Glenn Gaesser, a professor of exercise physiology at the University of Virginia. "There are a lot of kids who are just naturally heavier than their peers but may be even healthier. " [C] Difficult as it is to hear that your child is overweight, placing a child on an enforced diet may do more long-term harm than good. Doctors have yet to find a weight-loss program that has proved universally effective and safe, especially for children. More often, dieters will lose weight in the short run only to regain it. Research suggests that the repeated losing-regaining cycle can lead to loss in bone density and lean muscle mass, organs and bones, jeopardizing overall health. In fact, at least 15 major studies have shown higher death rates for adults after repeated losing regaining weight cycling. [D] Plus-size celebrities like Blonsky—or, for that matter, her Hairspray co-stars John Travolta (albeit in a latex fat suit) and Queen Latifah—are increasingly spreading the message that slim is not the last word in happy. Fit means happy too; so does staying active; so does loving your body no matter its shape. The key is to get that body healthy and keep it that way. The numbers on the scale—pediatricians, nutritionists and psychologists now argue—should start to come second to physical fitness as a gauge for health. [E] As many as 10 million women and 1 million men in the U. S. suffer from an eating disorder, according to the National Eating Disorder Association (NEDA). Nearly 90% of those afflicted are under the age of 20, and females between the ages of 15 and 24 are 12 times as likely to die from anorexia as any one other cause of, death. A 2005 study published in the journal Pediatrics determined that of 10,000 teens surveyed, less than half of the males and about a third of the females were happy with their bodies. "Parents face a complicated situation", Tim Brownell, an expert from NEDA, says. "They have to promote healthy weight, but they also don"t want to change children into diet-crazed fanatics. " [F] There was a time when that alone would have been enough to keep Blonsky, the 19-year-old star of the movie Hairspray, out of the fan magazines and off the posters decorating grade-schoolers" bedroom walls. But that time may at last be ending. The national obesity epidemic did not happen in a vacuum. It occurred in an era in which fashion models have got thinner and thinner, the tolerance for even a little flab has grown lower and lower, and the rates of eating disorders like anorexia have climbed higher and higher. In that environment, children and adolescents trying to develop a healthy body image have almost no chance at all.

答案: 正确答案:B
单项选择题

Computer brain games may not offer the big mental boost many were hoping for, suggests new research, but brain scientists and brain-game experts don"t all agree on the findings. The study, out this week in Nature, is the largest of its kind, say scientists from England"s Medical Research Council Cognition and Brain Sciences Unit and the Alzheimer"s Society, UK. They said in a Tuesday press briefing that brain-training games, used by millions, may not increase general brain power on other tasks or increase IQ "Participants did get better at games they practiced. The more they trained, the better they got. But there was still no translation to any general improvement in cognitive function," said lead author Adrian Owen, assistant director of Medical Research Council. The online experiment was sponsored by the BBC and involved more than 11 000 people between the ages of 18 and 60. They were split into three groups, including two groups that played different brain-training games that are similar to commercially available games, and a control group that was asked to go online and find answers to questions about topics such as music. Participants trained for at least 10 minutes a day, three times a week, for up to six weeks, Owen said. All took standard cognitive assessment tests at the start and finish of the study. While players increased their skills the more they played a specific game, that improvement didn"t transfer to other activities or to a higher score on intelligence tests, said Owen and colleagues. Duke psychiatrist and Alzheimer"s expert Murali Doraiswamy said it"s the best study done to date and a good reality check. "There was so much hype surrounding brain games," he said. But it"s not a death knell for gaming, Doraiswamy said. "I still think brain games offer tremendous potential for helping people with conditions such as ADHD and learning disabilities, but this study puts the burden of proof now on game manufacturers to show that they really offer meaningful benefits. " Study shortcomings include the fact that it didn"t focus on the aging population, a group targeted by brain-game makers, experts said. And it did not look at benefits of more intense training, said Alvaro Fernandez, CEO and cofounder of Sharp Brains, a San Francisco market research firm that specializes in cognitive science. "This study shows random brain exercise doesn"t transfer, but it does not deny that transfer can work if a person engages in more intense and targeted brain-training," Fernandez said.We can infer from Alvaro Fernandez"s view that______.

A.random brain exercise can improve cognitive function
B.the study does not focus on the benefits of brain games
C.people can improve their IQ by specific brain exercise
D.the brain-game has a lot of advantages
单项选择题

It"s seven weeks into the new year. Do you know where your resolution is If you"re like millions of Americans, you probably vowed to lose weight, quit smoking and drink less in the new year. You kicked off January with a commitment to long-term well-being--until you came face-to-face with a cheeseburger. You spent a bundle on a shiny new gym pass. Turns out, it wasn"t reason enough for you to actually use the gym. People can make poor decisions when it comes to health--despite their best intentions. It"s not easy abiding by wholesome choices (giving up French fries) when the consequences of not doing so (heart disease) seem so far in the future. Most people are bad at judging their health risks: smokers generally know cigarettes cause cancer, but they also tend to believe they"re less likely than other smokers to get it. And as any snack-loving dieter can attest, people can be comically inept at predicting their future .behavior. You swear you will eat just one potato chip but don"t stop until the bag is empty. So, what does it take to motivate people to stick to the path set by their conscious brain How can good choices be made to seem more appealing than bad ones The problem stumps doctors, public-health officials and weight-loss experts, but one solution may spring from an unlikely source. Meet your new personal trainer: your boss. American businesses have a particular interest in personal health, since worker illness costs them billions each year in insurance claims, sick days and high staff turnover. A 2008 survey of major US employers found that 64% consider their employees" poor health decisions a serious barrier to affordable insurance coverage. Now some companies are tackling the motivation problem head on, using tactics drawn from behavioral psychology to nudge their employees to get healthy. "It"s a bit paradoxical that employers need to provide incentives for people to improve their own health," says Michael Follick, a behavioral psychologist at Brown University and president of the consultancy Abacus Employer Health Solutions. Paradoxical, maybe, but effective. Consider Amica Mutual Insurance, based in Rhode Island. Arnica seemed to be doing everything right: it boasts an on-site fitness center at its headquarters. It pays toward Weight Watchers and smoking-cessation help, gives gift cards to reward proper prenatal care and offers free flu shots each year. Still, in the mid-2000s, about 7% of the company"s insured population, including roughly 3 100 employees and their dependents, had diabetes. "We manage risk. That"s our core business," says Scott Boyd, Amica"s director of compensation and benefits. But diabetes-related claims from Arnica employees had doubled in four years. "We thought, OK," Boyd says now, "we have to manage these high-risk groups a little better. "Which of the following is TRUE according to the text

A.If you want to keep healthy, you have to meet your personal trainer.
B.The diabetes-related claims from Arnica employees have been increased.
C.The American business doesn"t do anything concerned with personal health.
D.Abiding by healthy choices is facile.
单项选择题

When is an endangered species not an endangered species When it lives in the sea, apparently. Despite continuing carnage in the ocean, marine creatures were refused any protection at the United Nations conference on trade in wildlife that ended yesterday in Doha, Qatar. Tigers, rhinos and elephants are all better protected after the meeting of the Convention on International Trade in Endangered Species (Cites). But hammerhead sharks, bluefin tuna and other marine species should be quaking in their skins. For when it comes to fish, the world has decided that scientific evidence of imminent demise is not reason enough to defend them against overexploitation. The conflict between trade and conservation is nothing new, but it is pretty well established that if you let trade in wildlife run rampant (蔓延的), soon there will be nothing left to sell. That is why the UN set up Cites in the first place. So why did fish get such a raw deal Is it that we care less about life that is so very different from us Do the emotionless eyes of fish leave our hearts cold Is it an extension of the convenient myth that fish feel no pain The truth is far more shocking. All fingers of blame point directly at Japan. The high value of bluefin tuna--a single specimen can reach $112 000--led it to orchestrate a full-scale campaign against proposals to ban trade in the species. Diplomatic missions were sent to developing nations to bully them into agreeing with Japan"s conviction that fish cannot be endangered. That way of thinking is grounded in ignorance. The oceans long seemed infinite in their capacity to produce such riches, and any sign that this was not so was hidden by our inability to peer into the depths. Science has now stripped back the veil and revealed the extent of the depletion. It is this science that Japan and its allies have chosen to not to see. Unfortunately for life in the sea, Japan"s campaign made waves far beyond the bluefin. Sharks are in dire trouble thanks to some people"s appetite for using their fins in soup. About 73 million sharks are killed each year as a result, and sharks don"t reproduce fast. But far from favoring a ban, nations voted against even the most basic monitoring of the trade. Red and pink corals have now all but vanished from the Mediterranean and are being stripped from the Pacific, but proposals to control that trade were also swept away. Fish don"t recognise borders and boundaries. Yet one nation, Japan, by its cynical use of political power is robbing the world of a shared resource.The author"s attitude towards the fate of marine creatures is______.

A.optimistic
B.critical
C.worried
D.nonchalant
单项选择题

It"s not only humans that flourish in large settlements. Some ants find urban life so accommodating that their populations explode and they form supercolonies in cities. "One of the most common house ant species might have been built for living in some of the smallest spaces in a forest, but the ants have found ways to take advantage of the comforts of city living," Purdue University said in a statement. Grzegorz Buczkowski, a Purdue University research assistant professor of entomology, discovered odorous house ants live in supercolonies, creating complex networks entomologists have never seen with the species before now. He found that odorous house ant colonies become larger and more complex as they move from forest to city and act somewhat like an invasive species, the university said. "The ants live about 50 to a colony with one queen in forest settings but explode into supercolonies with more than 6 million workers and 50 000 queens in urban areas," the university explained. "This is a native species that"s doing this," said Buczkowski, whose results are published in the early online version of the journal Biological Invasions. "Native ants are not supposed to become invasive. We don"t know of any other native ants that are outcompeting other species of native ants like these," Buczkowski said. Odorous house ants live in hollow acorn shells in the forest. They"re called odorous because they have a coconut (椰子)-or rum-like smell when crushed. They"re considered one of the most common house ants, Purdue said. In semi-natural areas that are a cross of forest and urban areas, such as a park, Buczkowski said he observed colonies of about 500 workers with a single queen. "It"s possible that as the ants get closer to urban areas they have easier access to food, shelter and other resources," he said. "In the forest, they have to compete for food and nesting sites," Buczkowski said. "In the cities, they don"t have that competition. People give them a place to nest, food to eat. " Buczkowski observed the ants in three different settings on and around the Purdue campus. He said it might be expected that if the odorous house ants were able to multiply into complex colonies, other ants would do the same. But Buczkowski found no evidence that other ants had adapted to new environments and evolved into larger groups as the odorous house ants have, Purdie said. "It"s possible that odorous house ants are better adapted to city environments than other ant species or that they had somehow outcompeted or dominated other species," he said. "This raises a lot of questions we"d like to answer. " Buczkowski said understanding why the supercolonies form could lead to better control of the pests in homes, as well as ensuring that they don"t outcompete beneficial species. Future studies on odorous house ants will include studying the ant"s genetics and trying to understand the effects of urbanization of odorous house ants, Purdue said.The odorous house ants move to urban areas because they ______.

A.want to outcompete and dominate other species in cities
B.could have easier access to resources they need
C.have the ability to have a new place to nest
D.like to compete for food and nesting sites
问答题

Fit at Any Size Nikki Blonsky is exactly the role model most parents dream of for their kids. She"s happy, she"s successful, she"s overcome obstacles—no wonder her young fans adore her. She"s also overweight— by some measures very overweight—in a culture that fetishizes thin. (41)Blonsky is such a lucky dog, because she wouldn"t have been a popular figure she had been born a decade earlier. (42)Happiness might be the most difficult word to define, but at least people are increasingly aware of the fact that the body shape does not determine happiness. (43)Nobody likes to be over-weighted, yet it"s not our right to make the decision. (44)Before you let your kids to lose weight, you should make sure what they are losing, weight or health. (45)I{ you only feel hungry, then you can freely enjoy the joy of eating and drinking; however, if you bear the word "weight" in your mind, you can"t do that. Amid all this back-and-forth, however, there is one point that everyone agrees on: exercise definitely improves a child"s overall sense of well-being. Cooper, who invented aerobics a generation ago, has been testing the physical fitness of schoolchildren over the past decade and has consistently found that active kids do better academically, have fewer disciplinary issues and maintain better medical histories. "A child doesn"t need to be a star athlete or a tong-distance runner," Cooper says. "Even taking the stairs instead of an elevator has positive effects. " [A] There"s little doubt that being obese puts inactive youngsters at a higher risk for several health conditions, including Type 2 diabetes, high blood pressure and heart disease. But almost no studies have been done evaluating the pros and cons of kids being fat yet active. Plus, reports on adults in similar situations have conflicted. Since the 1970s, doctors at the nonprofit Cooper Institute in Dallas have gathered data from more than 100,000 patients who have been weighed, measured and made to run on treadmills while their vital signs are monitored. "We"ve long concluded that people who are overweight and active can be healthier than those who are thin but sedentary", says Dr. Kenneth Cooper, the institute"s director. "There"s no reason to believe that conclusion doesn"t apply to our children too. " [B] Behind the push to get kids fit is the growing recognition that, in many cases, there"s just no fighting the natural rhythms or shape of a child"s body. Throughout childhood and adolescence, hormones may cause weight to fluctuate dramatically. Plus, nature determines whether we"re all going to be stocky, a beanpole or something in between before we"re even born. "Most body weights and types for children and adults are genetically determined", says Glenn Gaesser, a professor of exercise physiology at the University of Virginia. "There are a lot of kids who are just naturally heavier than their peers but may be even healthier. " [C] Difficult as it is to hear that your child is overweight, placing a child on an enforced diet may do more long-term harm than good. Doctors have yet to find a weight-loss program that has proved universally effective and safe, especially for children. More often, dieters will lose weight in the short run only to regain it. Research suggests that the repeated losing-regaining cycle can lead to loss in bone density and lean muscle mass, organs and bones, jeopardizing overall health. In fact, at least 15 major studies have shown higher death rates for adults after repeated losing regaining weight cycling. [D] Plus-size celebrities like Blonsky—or, for that matter, her Hairspray co-stars John Travolta (albeit in a latex fat suit) and Queen Latifah—are increasingly spreading the message that slim is not the last word in happy. Fit means happy too; so does staying active; so does loving your body no matter its shape. The key is to get that body healthy and keep it that way. The numbers on the scale—pediatricians, nutritionists and psychologists now argue—should start to come second to physical fitness as a gauge for health. [E] As many as 10 million women and 1 million men in the U. S. suffer from an eating disorder, according to the National Eating Disorder Association (NEDA). Nearly 90% of those afflicted are under the age of 20, and females between the ages of 15 and 24 are 12 times as likely to die from anorexia as any one other cause of, death. A 2005 study published in the journal Pediatrics determined that of 10,000 teens surveyed, less than half of the males and about a third of the females were happy with their bodies. "Parents face a complicated situation", Tim Brownell, an expert from NEDA, says. "They have to promote healthy weight, but they also don"t want to change children into diet-crazed fanatics. " [F] There was a time when that alone would have been enough to keep Blonsky, the 19-year-old star of the movie Hairspray, out of the fan magazines and off the posters decorating grade-schoolers" bedroom walls. But that time may at last be ending. The national obesity epidemic did not happen in a vacuum. It occurred in an era in which fashion models have got thinner and thinner, the tolerance for even a little flab has grown lower and lower, and the rates of eating disorders like anorexia have climbed higher and higher. In that environment, children and adolescents trying to develop a healthy body image have almost no chance at all.

答案: 正确答案:C
单项选择题

Computer brain games may not offer the big mental boost many were hoping for, suggests new research, but brain scientists and brain-game experts don"t all agree on the findings. The study, out this week in Nature, is the largest of its kind, say scientists from England"s Medical Research Council Cognition and Brain Sciences Unit and the Alzheimer"s Society, UK. They said in a Tuesday press briefing that brain-training games, used by millions, may not increase general brain power on other tasks or increase IQ "Participants did get better at games they practiced. The more they trained, the better they got. But there was still no translation to any general improvement in cognitive function," said lead author Adrian Owen, assistant director of Medical Research Council. The online experiment was sponsored by the BBC and involved more than 11 000 people between the ages of 18 and 60. They were split into three groups, including two groups that played different brain-training games that are similar to commercially available games, and a control group that was asked to go online and find answers to questions about topics such as music. Participants trained for at least 10 minutes a day, three times a week, for up to six weeks, Owen said. All took standard cognitive assessment tests at the start and finish of the study. While players increased their skills the more they played a specific game, that improvement didn"t transfer to other activities or to a higher score on intelligence tests, said Owen and colleagues. Duke psychiatrist and Alzheimer"s expert Murali Doraiswamy said it"s the best study done to date and a good reality check. "There was so much hype surrounding brain games," he said. But it"s not a death knell for gaming, Doraiswamy said. "I still think brain games offer tremendous potential for helping people with conditions such as ADHD and learning disabilities, but this study puts the burden of proof now on game manufacturers to show that they really offer meaningful benefits. " Study shortcomings include the fact that it didn"t focus on the aging population, a group targeted by brain-game makers, experts said. And it did not look at benefits of more intense training, said Alvaro Fernandez, CEO and cofounder of Sharp Brains, a San Francisco market research firm that specializes in cognitive science. "This study shows random brain exercise doesn"t transfer, but it does not deny that transfer can work if a person engages in more intense and targeted brain-training," Fernandez said.Which of the followings is NOT the study"s disadvantage

A.It didn"t pay much attention to elderly people.
B.It didn"t focus on a group targeted by brain-game makers.
C.It didn"t take benefits of intense training into consideration.
D.It didn"t take the random brain exercise into consideration.
单项选择题

It"s seven weeks into the new year. Do you know where your resolution is If you"re like millions of Americans, you probably vowed to lose weight, quit smoking and drink less in the new year. You kicked off January with a commitment to long-term well-being--until you came face-to-face with a cheeseburger. You spent a bundle on a shiny new gym pass. Turns out, it wasn"t reason enough for you to actually use the gym. People can make poor decisions when it comes to health--despite their best intentions. It"s not easy abiding by wholesome choices (giving up French fries) when the consequences of not doing so (heart disease) seem so far in the future. Most people are bad at judging their health risks: smokers generally know cigarettes cause cancer, but they also tend to believe they"re less likely than other smokers to get it. And as any snack-loving dieter can attest, people can be comically inept at predicting their future .behavior. You swear you will eat just one potato chip but don"t stop until the bag is empty. So, what does it take to motivate people to stick to the path set by their conscious brain How can good choices be made to seem more appealing than bad ones The problem stumps doctors, public-health officials and weight-loss experts, but one solution may spring from an unlikely source. Meet your new personal trainer: your boss. American businesses have a particular interest in personal health, since worker illness costs them billions each year in insurance claims, sick days and high staff turnover. A 2008 survey of major US employers found that 64% consider their employees" poor health decisions a serious barrier to affordable insurance coverage. Now some companies are tackling the motivation problem head on, using tactics drawn from behavioral psychology to nudge their employees to get healthy. "It"s a bit paradoxical that employers need to provide incentives for people to improve their own health," says Michael Follick, a behavioral psychologist at Brown University and president of the consultancy Abacus Employer Health Solutions. Paradoxical, maybe, but effective. Consider Amica Mutual Insurance, based in Rhode Island. Arnica seemed to be doing everything right: it boasts an on-site fitness center at its headquarters. It pays toward Weight Watchers and smoking-cessation help, gives gift cards to reward proper prenatal care and offers free flu shots each year. Still, in the mid-2000s, about 7% of the company"s insured population, including roughly 3 100 employees and their dependents, had diabetes. "We manage risk. That"s our core business," says Scott Boyd, Amica"s director of compensation and benefits. But diabetes-related claims from Arnica employees had doubled in four years. "We thought, OK," Boyd says now, "we have to manage these high-risk groups a little better. "Which of the following would be the best title for the text

A.Making Good Health Easy
B.Cost of Losing Weight
C.Difficulties in Dieting
D.Advantages of Healthy Diet
问答题

Fit at Any Size Nikki Blonsky is exactly the role model most parents dream of for their kids. She"s happy, she"s successful, she"s overcome obstacles—no wonder her young fans adore her. She"s also overweight— by some measures very overweight—in a culture that fetishizes thin. (41)Blonsky is such a lucky dog, because she wouldn"t have been a popular figure she had been born a decade earlier. (42)Happiness might be the most difficult word to define, but at least people are increasingly aware of the fact that the body shape does not determine happiness. (43)Nobody likes to be over-weighted, yet it"s not our right to make the decision. (44)Before you let your kids to lose weight, you should make sure what they are losing, weight or health. (45)I{ you only feel hungry, then you can freely enjoy the joy of eating and drinking; however, if you bear the word "weight" in your mind, you can"t do that. Amid all this back-and-forth, however, there is one point that everyone agrees on: exercise definitely improves a child"s overall sense of well-being. Cooper, who invented aerobics a generation ago, has been testing the physical fitness of schoolchildren over the past decade and has consistently found that active kids do better academically, have fewer disciplinary issues and maintain better medical histories. "A child doesn"t need to be a star athlete or a tong-distance runner," Cooper says. "Even taking the stairs instead of an elevator has positive effects. " [A] There"s little doubt that being obese puts inactive youngsters at a higher risk for several health conditions, including Type 2 diabetes, high blood pressure and heart disease. But almost no studies have been done evaluating the pros and cons of kids being fat yet active. Plus, reports on adults in similar situations have conflicted. Since the 1970s, doctors at the nonprofit Cooper Institute in Dallas have gathered data from more than 100,000 patients who have been weighed, measured and made to run on treadmills while their vital signs are monitored. "We"ve long concluded that people who are overweight and active can be healthier than those who are thin but sedentary", says Dr. Kenneth Cooper, the institute"s director. "There"s no reason to believe that conclusion doesn"t apply to our children too. " [B] Behind the push to get kids fit is the growing recognition that, in many cases, there"s just no fighting the natural rhythms or shape of a child"s body. Throughout childhood and adolescence, hormones may cause weight to fluctuate dramatically. Plus, nature determines whether we"re all going to be stocky, a beanpole or something in between before we"re even born. "Most body weights and types for children and adults are genetically determined", says Glenn Gaesser, a professor of exercise physiology at the University of Virginia. "There are a lot of kids who are just naturally heavier than their peers but may be even healthier. " [C] Difficult as it is to hear that your child is overweight, placing a child on an enforced diet may do more long-term harm than good. Doctors have yet to find a weight-loss program that has proved universally effective and safe, especially for children. More often, dieters will lose weight in the short run only to regain it. Research suggests that the repeated losing-regaining cycle can lead to loss in bone density and lean muscle mass, organs and bones, jeopardizing overall health. In fact, at least 15 major studies have shown higher death rates for adults after repeated losing regaining weight cycling. [D] Plus-size celebrities like Blonsky—or, for that matter, her Hairspray co-stars John Travolta (albeit in a latex fat suit) and Queen Latifah—are increasingly spreading the message that slim is not the last word in happy. Fit means happy too; so does staying active; so does loving your body no matter its shape. The key is to get that body healthy and keep it that way. The numbers on the scale—pediatricians, nutritionists and psychologists now argue—should start to come second to physical fitness as a gauge for health. [E] As many as 10 million women and 1 million men in the U. S. suffer from an eating disorder, according to the National Eating Disorder Association (NEDA). Nearly 90% of those afflicted are under the age of 20, and females between the ages of 15 and 24 are 12 times as likely to die from anorexia as any one other cause of, death. A 2005 study published in the journal Pediatrics determined that of 10,000 teens surveyed, less than half of the males and about a third of the females were happy with their bodies. "Parents face a complicated situation", Tim Brownell, an expert from NEDA, says. "They have to promote healthy weight, but they also don"t want to change children into diet-crazed fanatics. " [F] There was a time when that alone would have been enough to keep Blonsky, the 19-year-old star of the movie Hairspray, out of the fan magazines and off the posters decorating grade-schoolers" bedroom walls. But that time may at last be ending. The national obesity epidemic did not happen in a vacuum. It occurred in an era in which fashion models have got thinner and thinner, the tolerance for even a little flab has grown lower and lower, and the rates of eating disorders like anorexia have climbed higher and higher. In that environment, children and adolescents trying to develop a healthy body image have almost no chance at all.

答案: 正确答案:E
问答题

There are many innovations turning up in the latest experimental and production electric cars, affecting everything from batteries to motors to control systems. The need to make them all work together is prompting a complete rethink about the way cars should be designed and manufactured, and it is unclear which technologies will dominate as the constraints imposed by internal combustion engines give way to the new limits and possibilities associated with electric propulsion. (46) But one group of engineers have stuck their necks out and declared that a particular technology, the electric hub motor, is likely to become the most widely used drive system. At this week"s Deutsche Messe technology show in Hanover, researchers at the Fraunhofer Institute displayed an electric vehicle which they are using as a test platform to investigate new vehicle systems. (47) It includes electric hub motors, which they have developed to be markedly more powerful than any such motors currently available. The motors have all the necessary power and control systems integrated into the wheel hub, greatly reducing the number of connections between the hub motors and the rest of the vehicle. (48) Because hub motors can deliver power independently to each wheel, tricks like four-wheel-drive are possible, and with software monitoring each wheel, stability and traction control can also be built-in. Besides dispensing with the traditional engine bay on a car, hub motors save space and weight because there is no need for a mechanical transmission, with its driveshafts and differential units. (49) Some critics of the technology think having heavy electric motors in the wheels of cars will have a negative effect on vehicle handling. But Hermann Pleteit, a project manager with one of the 33 Fraunhofer research centres that have teamed up to work on the experimental car, says the chassis and many other parts of the vehicle can be configured in such a way to compensate for this. Several carmakers and component suppliers are interested in hub motors. Michelin, for one, is developing a system it calls the Active Wheel. (50) As well as an electric motor to drive the wheel, it contains a second electric motor to operate an active suspension system that is also built into the wheel hub. Michelin reckons this arrangement, which is now being tested in cars, could make other conventional parts, like shock absorbers, unnecessary.

答案: 正确答案:但是,有一组工程师却冒险宣布了一项特殊的技术——发电轮毂电机,它可能会成为最广泛应用的驱动系统。
问答题

There are many innovations turning up in the latest experimental and production electric cars, affecting everything from batteries to motors to control systems. The need to make them all work together is prompting a complete rethink about the way cars should be designed and manufactured, and it is unclear which technologies will dominate as the constraints imposed by internal combustion engines give way to the new limits and possibilities associated with electric propulsion. (46) But one group of engineers have stuck their necks out and declared that a particular technology, the electric hub motor, is likely to become the most widely used drive system. At this week"s Deutsche Messe technology show in Hanover, researchers at the Fraunhofer Institute displayed an electric vehicle which they are using as a test platform to investigate new vehicle systems. (47) It includes electric hub motors, which they have developed to be markedly more powerful than any such motors currently available. The motors have all the necessary power and control systems integrated into the wheel hub, greatly reducing the number of connections between the hub motors and the rest of the vehicle. (48) Because hub motors can deliver power independently to each wheel, tricks like four-wheel-drive are possible, and with software monitoring each wheel, stability and traction control can also be built-in. Besides dispensing with the traditional engine bay on a car, hub motors save space and weight because there is no need for a mechanical transmission, with its driveshafts and differential units. (49) Some critics of the technology think having heavy electric motors in the wheels of cars will have a negative effect on vehicle handling. But Hermann Pleteit, a project manager with one of the 33 Fraunhofer research centres that have teamed up to work on the experimental car, says the chassis and many other parts of the vehicle can be configured in such a way to compensate for this. Several carmakers and component suppliers are interested in hub motors. Michelin, for one, is developing a system it calls the Active Wheel. (50) As well as an electric motor to drive the wheel, it contains a second electric motor to operate an active suspension system that is also built into the wheel hub. Michelin reckons this arrangement, which is now being tested in cars, could make other conventional parts, like shock absorbers, unnecessary.

答案: 正确答案:新的车辆系统包括发电轮毂电机,他们已经将它发展成为明显强于现有的任何此类电机的发动机。
问答题

There are many innovations turning up in the latest experimental and production electric cars, affecting everything from batteries to motors to control systems. The need to make them all work together is prompting a complete rethink about the way cars should be designed and manufactured, and it is unclear which technologies will dominate as the constraints imposed by internal combustion engines give way to the new limits and possibilities associated with electric propulsion. (46) But one group of engineers have stuck their necks out and declared that a particular technology, the electric hub motor, is likely to become the most widely used drive system. At this week"s Deutsche Messe technology show in Hanover, researchers at the Fraunhofer Institute displayed an electric vehicle which they are using as a test platform to investigate new vehicle systems. (47) It includes electric hub motors, which they have developed to be markedly more powerful than any such motors currently available. The motors have all the necessary power and control systems integrated into the wheel hub, greatly reducing the number of connections between the hub motors and the rest of the vehicle. (48) Because hub motors can deliver power independently to each wheel, tricks like four-wheel-drive are possible, and with software monitoring each wheel, stability and traction control can also be built-in. Besides dispensing with the traditional engine bay on a car, hub motors save space and weight because there is no need for a mechanical transmission, with its driveshafts and differential units. (49) Some critics of the technology think having heavy electric motors in the wheels of cars will have a negative effect on vehicle handling. But Hermann Pleteit, a project manager with one of the 33 Fraunhofer research centres that have teamed up to work on the experimental car, says the chassis and many other parts of the vehicle can be configured in such a way to compensate for this. Several carmakers and component suppliers are interested in hub motors. Michelin, for one, is developing a system it calls the Active Wheel. (50) As well as an electric motor to drive the wheel, it contains a second electric motor to operate an active suspension system that is also built into the wheel hub. Michelin reckons this arrangement, which is now being tested in cars, could make other conventional parts, like shock absorbers, unnecessary.

答案: 正确答案:由于轮毂电机可以独立地向每个轮子传送能量,类似四轮驱动的技术成为可能,通过每个轮子的程序监督器,也可以内置稳定...
问答题

There are many innovations turning up in the latest experimental and production electric cars, affecting everything from batteries to motors to control systems. The need to make them all work together is prompting a complete rethink about the way cars should be designed and manufactured, and it is unclear which technologies will dominate as the constraints imposed by internal combustion engines give way to the new limits and possibilities associated with electric propulsion. (46) But one group of engineers have stuck their necks out and declared that a particular technology, the electric hub motor, is likely to become the most widely used drive system. At this week"s Deutsche Messe technology show in Hanover, researchers at the Fraunhofer Institute displayed an electric vehicle which they are using as a test platform to investigate new vehicle systems. (47) It includes electric hub motors, which they have developed to be markedly more powerful than any such motors currently available. The motors have all the necessary power and control systems integrated into the wheel hub, greatly reducing the number of connections between the hub motors and the rest of the vehicle. (48) Because hub motors can deliver power independently to each wheel, tricks like four-wheel-drive are possible, and with software monitoring each wheel, stability and traction control can also be built-in. Besides dispensing with the traditional engine bay on a car, hub motors save space and weight because there is no need for a mechanical transmission, with its driveshafts and differential units. (49) Some critics of the technology think having heavy electric motors in the wheels of cars will have a negative effect on vehicle handling. But Hermann Pleteit, a project manager with one of the 33 Fraunhofer research centres that have teamed up to work on the experimental car, says the chassis and many other parts of the vehicle can be configured in such a way to compensate for this. Several carmakers and component suppliers are interested in hub motors. Michelin, for one, is developing a system it calls the Active Wheel. (50) As well as an electric motor to drive the wheel, it contains a second electric motor to operate an active suspension system that is also built into the wheel hub. Michelin reckons this arrangement, which is now being tested in cars, could make other conventional parts, like shock absorbers, unnecessary.

答案: 正确答案:这项技术的批评者认为在车轮上安装沉重的电动机对车辆的操纵有负面影响。
问答题

There are many innovations turning up in the latest experimental and production electric cars, affecting everything from batteries to motors to control systems. The need to make them all work together is prompting a complete rethink about the way cars should be designed and manufactured, and it is unclear which technologies will dominate as the constraints imposed by internal combustion engines give way to the new limits and possibilities associated with electric propulsion. (46) But one group of engineers have stuck their necks out and declared that a particular technology, the electric hub motor, is likely to become the most widely used drive system. At this week"s Deutsche Messe technology show in Hanover, researchers at the Fraunhofer Institute displayed an electric vehicle which they are using as a test platform to investigate new vehicle systems. (47) It includes electric hub motors, which they have developed to be markedly more powerful than any such motors currently available. The motors have all the necessary power and control systems integrated into the wheel hub, greatly reducing the number of connections between the hub motors and the rest of the vehicle. (48) Because hub motors can deliver power independently to each wheel, tricks like four-wheel-drive are possible, and with software monitoring each wheel, stability and traction control can also be built-in. Besides dispensing with the traditional engine bay on a car, hub motors save space and weight because there is no need for a mechanical transmission, with its driveshafts and differential units. (49) Some critics of the technology think having heavy electric motors in the wheels of cars will have a negative effect on vehicle handling. But Hermann Pleteit, a project manager with one of the 33 Fraunhofer research centres that have teamed up to work on the experimental car, says the chassis and many other parts of the vehicle can be configured in such a way to compensate for this. Several carmakers and component suppliers are interested in hub motors. Michelin, for one, is developing a system it calls the Active Wheel. (50) As well as an electric motor to drive the wheel, it contains a second electric motor to operate an active suspension system that is also built into the wheel hub. Michelin reckons this arrangement, which is now being tested in cars, could make other conventional parts, like shock absorbers, unnecessary.

答案: 正确答案:除了使用一个电动机驱动车轮,该系统中还安装了第二个电动机,用来运转主动减震系统,这个减震系统也被固定在轮毂之中...
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