单选题 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 80% of cancer is related to the diet as well. Different cultures are more prone to contract certain illnesses because of the food that is characteristic in these cultures. That food related to illness is not a new discovery. In 1945, government researchers realized that nitrates (硝酸盐) and nitrites (亚硝酸盐), commonly used to preserve colour in meat, and other food additives, caused cancer. Yet, these carcinogenic (致癌的) 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 poultry, and because of this, penicillin has been found in the milk of treated cows. Sometimes similar drugs are administered to animals not for medicinal 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.

单选题 What is the main topic of the passage?

A. Food and our health.
B. Food and additives.
C. Food and cancer.
D. Food and culture.

【正确答案】 A

【答案解析】[解析] 从文章开头一句以及全文内容可以得出答案。

单选题 All of the following statements are true EXCEPT______.

A. 80% of cancer is caused by problems related to food
B. researchers have known about the potential danger of food additives for many years
C. we eat some of the food additives directly and some indirectly
D. drugs are always given to animals for medicinal purposes

【正确答案】 D

【答案解析】[解析] 细节题。文章第二段说到农民为了获得更高的市场价格，为了经济原因而不是医学的原因。

单选题 Why do farmers give drugs to their animals?

A. To speed up the growth of animals.
B. To make the animals fatter.
C. To make the animals' meat fit to eat
D. To make the animals' meat rich in nutrients.

【正确答案】 B

【答案解析】[解析] 第二段提到“The farmers are simply Wing to fatten the animals in order to obtain a higher price on the market．”理解fatten一词的含义是“养肥，使肥胖”的意思。

单选题 It can be inferred from the passage that______.

A. scientists have made all the food fit to eat
B. only in recent years have people found that food is related to one's illnesses
C. all kinds of cancer are related to the diet
D. some additives are harmful to our health

【正确答案】 D

【答案解析】[解析] 文中提到“nitrates and nitrites…and other food additives，caused cancer"，所以选 D“一些添加剂有害健康”。

单选题 The word "this" in the second sentence of paragraph 2 most probably refers to______.

A. farmers
B. penicillin
C. beef and poultry
D. the fact lhat farmers often give penicillin to beef

【正确答案】 D

【答案解析】[解析] 文中第二段提到“Farmers often give penicillin to beef and poultry，and because of this”，根据题意应该选D。