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B. is essential for producing fruit and vegetables C. contains unused vegetable matter
D. has had chemicals and fertilizers added to it
18. According to the author, the use of chemicals and fertilizers ____. A. will not necessarily increase the production of foods B. is a good way to improve the quality of foods
C. promotes the foods both in quality and in quantity D. is no good for health
19. Chickens can be called “natural foods” only when ____. A. they are delicious
B. they are fed on food little better than rubbish C. they lay eggs rich in vitamins every day
D. they are allowed to move about and eat freely
20. Which of the following is considered good for healthy eating? A. Unrefined flour and vegetables. B. White bread and honey.
C. Canned beans and fruits. D. Mass-produced chickens and eggs
Passage Four(英语专业必做)
Questions 16～20 are based on the followlng passage.
Drunken driving-sometimes called America's socially accepted form of murderhas become a national epidemic. Every hour of every day about three Americans on average are killed by drunken drivers, adding up to an incredible 250,000 over the past decade.
Heavy drinking used to be an acceptable part of the American macho(男子汉)image and judges were lenient in most courts, but the drunken slaughter has recently caused so many well-publicized tragedies, especially involving your children, that public opinion is no longer so tolerant.
Twenty states have raised the legal drinking age to 21, reversi