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.

　　Passage 3

　　Questions 11 to 15 are based on the following passage:

　　Unlike their American or European counterparts, car salesmen in Japan work hard to get a buyer. Instead of lying lazily around showrooms waiting for customers to drop by, many Japanese car salesmen still go out to get them. They walk wearily along the streets cars door-to-door. New customers are hunted with fruit and cakes on their birthdays. But life is getting tough, and not just because new-car sales are falling.

　　With more Japanese women (who often control the household budget) going out to work, the salesmen increasingly find nobody at home when they call. That means another visit in the evening or the weekend. Then they face an extra problem: more people, especially the young, prefer to choose a new car from a showroom where they can compare different models.

　　Even as late as the mid-1980s some 90% of new cars were sold door-to-door. In some rural areas most new cars are still sold this way. But in the big cities more than half the new cars are now sold from showrooms.

　　Although investing in showrooms is expensive because of the high cost of Japanese land, dealers have little choice. A labor shortage and higher expectations among Japan’s workforce are making it difficult to hire door-to-door salesmen. Most of a Japanese car salesman’s working day is spent doing favors for customers, like arranging insurance or picking up vehicles for servicing, rather than actually selling.

　　Japan’s doorstep car salesmen are not about to vanish. The personal service they provide is so deep-rooted in Japan that they are likely to operate alongside the glittering new showrooms. The two systems even complement each other. What increasingly happens is that the showroom attracts the interest of a potential buyer, giving the footsore salesmen a firm lead to follow up with a home visit.