Questions 6 to 10 are based on the following passage:

　　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 tat 40 percent of cancer is related to the diet as well, especially cancer of the colon. Different cultures ate more prone to get certain illnesses because of the food that is characteristic in these cultures. That food is 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 that 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.

　　6. How has science done a disservice to mankind?

　　A. Because of science, most of the foods we eat today are contaminated.

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

　　C. As a result of scientific intervention, some potentially harmful substances has been added to our food.

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

　　7. What are nitrates used for?

　　A. They preserves 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.

　　8. The FDA has tried repeatedly to control .

　　A. the attempt to fatten the animals

　　B. the attempt to cure sick animals

　　C. the using of drugs to animals

　　D. the using of additives to preserve the dolor of food

　　9. The word “carcinogenic” means most nearly the same as .

　　A. trouble-making B. color-retaining

　　C. money-saving D. cancer-causing

　　10. 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 hazards of the food additives for over thirty-five years.

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

　　【答案】6-10 CBCDA