The food we eat seems to have profound effects on our health. Although science has made enormous steps in making food more fit to eat, it has, at the same time, made many foods unfit to eat. Some research has shown that perhaps eighty percent of all human illnesses are related to diet and forty percent of cancer is related to the diet as well, especially cancer of the colon. Different cultures are more likely to cause certain different illnesses because of the food that is characteristic in these cultures. That food is related to illness is not a new discovery. In 1945, about 35 years ago, government researchers realized that nitrates（硝酸盐）, commonly used to preserve color in meats, and other food additives（添加剂）, caused cancer. Yet, these carcinogenic additives remain in our food, and it becomes more difficult all the time to know which things on the packaging labels of processed food are helpful or harmful. The additives which we eat are not all so direct. Farmers often give penicillin（青霉素）to beef and living animals, and because of this, penicillin has been found in the milk of treated cow. Sometimes similar drugs are given to animals not for medical purposes, but for financial reasons. The farmers are simply trying to fatten the animals in order to obtain a higher price on the market. Although the Food and Drug Administration (FDA) has tried repeatedly to control these procedures, the practices continue.

The food we eat seems to have profound effects on our health. Although science has made enormous steps in making food more fit to eat, it has, at the same time, made many foods unfit to eat. Some research has shown that perhaps eighty percent of all human illnesses are related to diet and forty percent of cancer is related to the diet as well, especially cancer of the colon. Different cultures are more likely to cause certain different illnesses because of the food that is characteristic in these cultures. That food is related to illness is not a new discovery. In 1945, about 35 years ago, government researchers realized that nitrates（硝酸盐）, commonly used to preserve color in meats, and other food additives（添加剂）, caused cancer. Yet, these carcinogenic additives remain in our food, and it becomes more difficult all the time to know which things on the packaging labels of processed food are helpful or harmful. The additives which we eat are not all so direct. Farmers often give penicillin（青霉素）to beef and living animals, and because of this, penicillin has been found in the milk of treated cow. Sometimes similar drugs are given to animals not for medical purposes, but for financial reasons. The farmers are simply trying to fatten the animals in order to obtain a higher price on the market. Although the Food and Drug Administration (FDA) has tried repeatedly to control these procedures, the practices continue.

    There are various kinds of student exchange programs between the United States and other countries. Here are some that most interest foreign students.
    ASSE is the American Scandinavian Student Exchange. This program was established in Sweden in nineteen seventy-six to organize exchanges with the United States. It expanded to include students in Denmark, Norway, and Finland. Today ASSE organizes international exchanges for high school students in thirty-one countries. The students live with a family and attend school for a year.
    Other programs also offer high school students a chance to come to the United States, like the Program of Academic Exchange, or PAE.
    For college students, there are programs like the International Student Exchange Program, or ISEP. This is a group of almost three hundred colleges in thirty-nine countries. ISEP is an independent organization that was supported by the United States government until nineteen ninety-six. ISEP is a true exchange program. That means two students from different countries trade places for a semester or a year.
    Work and Travel USA is also for college students. But this program is not for those who want to study in the United States. It provides international students with the chance to work for up to four months while exploring American life. The State Department says they generally work in hotels, restaurants and amusement parks but may also work for other employers. An organization called CIEE administers this program. It says students must understand that the money they earn from their work may not be enough to pay all of their costs.

    There are various kinds of student exchange programs between the United States and other countries. Here are some that most interest foreign students.
    ASSE is the American Scandinavian Student Exchange. This program was established in Sweden in nineteen seventy-six to organize exchanges with the United States. It expanded to include students in Denmark, Norway, and Finland. Today ASSE organizes international exchanges for high school students in thirty-one countries. The students live with a family and attend school for a year.
    Other programs also offer high school students a chance to come to the United States, like the Program of Academic Exchange, or PAE.
    For college students, there are programs like the International Student Exchange Program, or ISEP. This is a group of almost three hundred colleges in thirty-nine countries. ISEP is an independent organization that was supported by the United States government until nineteen ninety-six. ISEP is a true exchange program. That means two students from different countries trade places for a semester or a year.
    Work and Travel USA is also for college students. But this program is not for those who want to study in the United States. It provides international students with the chance to work for up to four months while exploring American life. The State Department says they generally work in hotels, restaurants and amusement parks but may also work for other employers. An organization called CIEE administers this program. It says students must understand that the money they earn from their work may not be enough to pay all of their costs.

    There are various kinds of student exchange programs between the United States and other countries. Here are some that most interest foreign students.
    ASSE is the American Scandinavian Student Exchange. This program was established in Sweden in nineteen seventy-six to organize exchanges with the United States. It expanded to include students in Denmark, Norway, and Finland. Today ASSE organizes international exchanges for high school students in thirty-one countries. The students live with a family and attend school for a year.
    Other programs also offer high school students a chance to come to the United States, like the Program of Academic Exchange, or PAE.
    For college students, there are programs like the International Student Exchange Program, or ISEP. This is a group of almost three hundred colleges in thirty-nine countries. ISEP is an independent organization that was supported by the United States government until nineteen ninety-six. ISEP is a true exchange program. That means two students from different countries trade places for a semester or a year.
    Work and Travel USA is also for college students. But this program is not for those who want to study in the United States. It provides international students with the chance to work for up to four months while exploring American life. The State Department says they generally work in hotels, restaurants and amusement parks but may also work for other employers. An organization called CIEE administers this program. It says students must understand that the money they earn from their work may not be enough to pay all of their costs.

    There are various kinds of student exchange programs between the United States and other countries. Here are some that most interest foreign students.
    ASSE is the American Scandinavian Student Exchange. This program was established in Sweden in nineteen seventy-six to organize exchanges with the United States. It expanded to include students in Denmark, Norway, and Finland. Today ASSE organizes international exchanges for high school students in thirty-one countries. The students live with a family and attend school for a year.
    Other programs also offer high school students a chance to come to the United States, like the Program of Academic Exchange, or PAE.
    For college students, there are programs like the International Student Exchange Program, or ISEP. This is a group of almost three hundred colleges in thirty-nine countries. ISEP is an independent organization that was supported by the United States government until nineteen ninety-six. ISEP is a true exchange program. That means two students from different countries trade places for a semester or a year.
    Work and Travel USA is also for college students. But this program is not for those who want to study in the United States. It provides international students with the chance to work for up to four months while exploring American life. The State Department says they generally work in hotels, restaurants and amusement parks but may also work for other employers. An organization called CIEE administers this program. It says students must understand that the money they earn from their work may not be enough to pay all of their costs.

    There are various kinds of student exchange programs between the United States and other countries. Here are some that most interest foreign students.
    ASSE is the American Scandinavian Student Exchange. This program was established in Sweden in nineteen seventy-six to organize exchanges with the United States. It expanded to include students in Denmark, Norway, and Finland. Today ASSE organizes international exchanges for high school students in thirty-one countries. The students live with a family and attend school for a year.
    Other programs also offer high school students a chance to come to the United States, like the Program of Academic Exchange, or PAE.
    For college students, there are programs like the International Student Exchange Program, or ISEP. This is a group of almost three hundred colleges in thirty-nine countries. ISEP is an independent organization that was supported by the United States government until nineteen ninety-six. ISEP is a true exchange program. That means two students from different countries trade places for a semester or a year.
    Work and Travel USA is also for college students. But this program is not for those who want to study in the United States. It provides international students with the chance to work for up to four months while exploring American life. The State Department says they generally work in hotels, restaurants and amusement parks but may also work for other employers. An organization called CIEE administers this program. It says students must understand that the money they earn from their work may not be enough to pay all of their costs.

One of the most critical problems【1】black and other minority Americans today is the difficulty of entering mainstream society without【2】their own racial and ethnic heritage.The process can be an agonizing one，and it sometimes【3】disaster.On June 12，1985，Edmund Perry was shot and killed【4】attempting to rob a plainclothes police officer.Perry was【5】and a resident of Harlem；he was 【6】a graduate of one of the nation's finest high schools and was preparing to enter Stanford University【7】a full scholarship.The Two Worlds of Edmund Perry relates the details of this star student's【8】life and examines the unique pressure of【9】between two radically different social realism.This sense of doubleness experienced by many nonwhite Americans makes it difficult【10】a stable personal identity from outside，the author offers a solution【11】the problem.【12】in the rural south，she learned two languages，one to be used when speaking to family and friends，【13】when speaking to whites.Years later，after enrolling in a writing course at a northern university，she attempted to negotiate a way between her own language and the language of others：I could not—in the process of composing use the language of the old time，yet I couldn't imagine myself in the language.【14】，however，she learned to shape her own experience in her own words.Writing，she suggests，provided a valuable tool【15】elping to establish a balance between her two worlds.