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 eighty percent of cancer is related to the diet as well, especially cancer of the colon. 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 and nitrites, 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 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?

单选题 All of the following statements are true EXCEPT ______.

A、 Eighty percent 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】细节题。A答案在第一段第三行。B答案第一段第四行，not a new discovery和1945。C答案在第一段第七行和第二段第一句。直接间接吃食物添加剂都有。D答案，所有的食物添加剂都是医疗目的。错误，第二段第二行到第三行，有的食物添加剂是经济利益的原因才添加的。

单选题 Why do farmers give drugs to their animals?

单选题 It can be inferred from the passage that ______.

【正确答案】 D

【答案解析】推理题。A科学家没有让食物适合吃，最后一句，仍然在尝试努力。B only in recent years和第一段第五行not a new discovery相反。C，all kinds of cancer不是80%的才于食物有关。D，有的食物添加剂对健康有害，第一段六七八行说，添加剂引起癌症，有些有帮助食物，有些有害。