Passage Two
What you’ve always heard We’re eating way too much salt. The average American gets about 3.4 grams of sodium every day, far more than the upper limit of 2. 3 grams recommended by the USDA. The Institute of Medicine estimates that reducing sodium intake (摄取量) nationwide could prevent 100,000 deaths every year.
The headlines now It’s time to get tough. The New York City health department recently kicked off a national effort to cut the amount of salt in packaged and restaurant food by 25% over five years. 80% of the salt in the average person’s diet comes from those sources, not from the sahshaker (盐瓶).
But wait! The benefits of salt reduction are surprisingly mruky. At least 13 studies have tried to find out what happens to people who choose to eat salty or not-so-salty food--and the results have pointed in eve~3~ direction. Sonre studies suggest that cutting salt protects the heart; others suggest that intense salt reduction can actually increase heart problems. What’s needed,Dr. Michael Alderman says, is a randomized (随机的) , controlled trial, in which people are put on different diets and followed for years. It’s the only way to get a reliable answer, but it’s never been done.
So what should you do Go easy on processed foods and eat more produce. Those changes will improve your diet in a variety of ways and cut the amount of sodium you consume. If your blood pressure is high, work with your doctor to control it with drugs and lifestyle changes. If your blood pressure is healthy At this point, there’s no convincing reason for you to count every grain.
A.Unclear
B.Significant
C.Obvious
D.Exaggerated
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Passage Three
There is a tale that straw is the worst material from which to build a house, particularly if you are a pig with a hungry wolf around. So the cards were stacked against Warren Brush when local officials learned that he had several buildings made of straw bales ( 大捆 ) on his land.
They have tried to fine him a lot. But the case is still unresolved. The problem is that California’s building codes make no provision for the use of straw. And Mr Brush has many defenders--among them several university scientists and David Eisenberg, the chairman of the United States Green Building Council’s code connnittee. They would like to see the prejudice against straw houses eliminated, for straw is, in many ways, an ideal building material.
It is, for one thing, a great insulator (绝缘体). That keeps down the heating bills in houses made from it. It is also a waste product that would otherwise be burned, and is therefore cheap, and very much to the point in a place like California, it is earthquake-resistant. Last year a test conducted at the University of Nevada showed that straw-bale constructions could’ withstand twice the amount of ground motion recorded in the Northridge earthquake that hit LosAngeles in 1994.
There are other straws in the wind: a post office in suburban Albuquerque, a school in Maryland, and an office complex in suburban Los Angeles have all been built from straw. Even California is having a rethink, and may change its rules to adapt to straw-bale construction. As Mr Eisenberg observes, "the lesson of the Three Little Pigs isn’t to avoid straw. It’s that you don’t let a pig build your house."
A.as a representative of official opinions
B.for the purpose of supporting Warren Brush
C.to provide evidence against straw houses
D.to show the importance of the building codes
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