根据下面内容，回答下面试题

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 iflness is not a new discovery. In 1945, about 70 years ago, government researchers realized that nitrates, commonly used to preserve color in meats, and other food additives, 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 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.

第21题单选 What is the best possible title of the passage?

A. Drug and Food

B. Cancer and Health

C. Food and Health

D. Health and Drug

参考答案：C

第22题单选 Which of the following statements is NOT true?

A. Drugs are always given to animals for medical reasons.

B. Some of the additives in our food are added to the food itself and some are given to the living animals.

C. Researchers have known about the potential dangers of food additives for about seventy years.

D. Food may cause forty percent of cancer in the world.

参考答案：A

第23题单选 How has science done something harmful to mankind?

A. Because of science, diseases caused by polluted food have been virtually eliminated.

B. It has caused a lack of information concerning the value of food.

C. Because of the application of science, some potentially harmful substances have been added to food.

D. The scientists have preserved the color of meats, but not of vegetables.

参考答案：C

第24题单选 What are nitrates used for?

A. They preserve flavor in packaged foods.

B. They preserve the color of meats.

C. They are the objects of research.

D. They cause the animals to become fatter.

参考答案：B

第25题单选 The word "carcinogenic" most nearly means "__________".

A. trouble-making

B. color-retaining

C. money-making

D. cancer-causing

参考答案：D

根据下面内容，回答下面试题

Many visitors find the fast pace at which American people move very troubling. One' s first impression is likely to be that everyone is in a rush. City people always appear to be hurrying to get where they are going and are very impatient if they are delayed even for a brief moment.

At first, this may seem unfriendly to you. Drivers will rush you ; storekeepers will be in a hurry as they serve you ; people will push past you as they walk along the street. You will miss smiles, brief conversations with people as you shop or dine away from home. Do not think that because Americans are in such a hurry they are unfriendly. Often life is much slower outside the big cities, as is true in other countries as well.

Americans who live in cities such as New York, Chicago, or Los Angeles, often think that everyone is equally in a hurry to get things done; they expect others to "push back", just as city people do in Tokyo, Singapore or Paris, for example. But when they discover that you are a stranger, most Americans become quite kindly and will take great care to help you. Many of them first came to the city as strangers and they remember how frightening a new city can be. If you need help or want to ask a question, choose a friendly-looking person and say, "I am a stranger here. Can you help me?"

Most people will stop, smile at you, and help you find your way, or answer your questions. But you must let them know that you need help. Otherwise they are likely to pass you by, not noticing that you are new to the city and in need of help. Occasionally, you may find someone too busy or perhaps too rushed to give you aid. If this happens, do not be discouraged : just ask someone else. Most Americans enjoy helping a stranger.

第26题单选 Many people who first visit the United States will find that __________.

A. America is a highly developed country

B. American city people seem to be always in a rush

C. the fast pace in American life often causes much trouble

D. Americans are important and unfriendly people

参考答案：B

第27题单选 When the author says "you will miss smiles" in the second paragraph, he means __________.

A. you will fail to notice that American are pleasant and happy

B. you will be puzzled why Americans do not smile at you

C. you will feel that Americans do not seem very friendly

D. you will find that Americans don' t have much sense of humor

参考答案：C

第28题单选 In the author' s opinion, __________.

A. it is true that life in New York is much faster than that in any other city.

B. people living outside big cities are lazy and miserable.

C. most American people enjoy living in the suburbs of big cities.

D. those who are busy are not necessary unfriendly.

参考答案：D

第29题单选 The author mentions big cities such as Tokyo, Singapore and Paris__________.

A. to show that city people all over the world have a lot in common

B. to let his readers be aware that they are some of the world' s biggest cities

C. to illustrate their difference from American cities

D. because they are some of the cities that attract visitors most

参考答案：A

第30题单选 If you say to an American that you are a stranger there, most probably he will __________.

A. offer his help

B. stop smiling at you

C. help you find the way

D. reply that he is pleased to meet you

参考答案：A

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