题目内容
Traditional technologies and materials have been replaced by advanced apparatus and substances of modern society.
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听力原文： To most of us sharks are the most dangerous fish in the sea and they attack humans. However, according to Dr. Clark, who bas studied the behavior. of sharks for twelve years, humans are nor normally on the shark's menu. What do sharks feed on？ Mainly fish and other sea animals. Dr. Clark. also found that sharks don't eat as much food as people think. For instance, a nine-year-old shark only needs two pounds of food a day to keep healthy. But she says, sharks sometimes starve and at other times they fill themselves with what they have killed. Around the world, there are only about one hundred shark attacks on humans each year, ten of which prove fatal. But consider this: in the U. $. alone, about three million people are bitten by dogs each year. Of these, thirty people die. If a shark bites you, says Dr. Clark, the reason is usually because they mistake you for natural food. For example, say you went underwater-fishing and saw a shark. You could be in trouble. The shark might go for the injured fish you had attacked and take a bite of you at the same time. If you go 'into a shark's territory and threaten it, it might try to bite you. That's because sharks are territorial and tend to guard their territory. Like dogs, they protect the area they think is their own.
(30)
听力原文： Do you have trouble sleeping at night？ Then maybe this is for you. When you worry about needing sleep and toss and turn trying to find a comfortable position, you're probably only making matters worse. What happens when you do that is that your heart rate actually increases, making it more difficult to relax. You may also have some bad habits that contribute to the problem. Do you rest frequently during the day？ Do you get virtually no exercise, or do you exercise strenuously late in the day？ Are you preoccupied with sleep？ Or do you sleep late on weekends？ Any or all of these factors might be leading to your insomnia by disrupting your body's natural rhythm. What should you do then, on those sleepless nights？ Don't bother with sleeping pills. They can actually cause worse insomnia later. The best thing to do is drink milk, or cat cheese or tuna fish. These are all rich in amino acids and help produce a neurotransmitter in the brain that induces sleep. This neurotransmitter will help you relax, and you'll be on your way to getting a good night's sleep. Until tomorrow's broadcast, this has been another in the series "Hints for Good Health."
(33)
听力原文：W: Hi, John, how's your project going？
M: Oh, just so-so. You know, it seems less difficult to get financial support for the project than to get trained men.
Q: What do we know about the man's project？
(17)
A．Failure to rest during the day.B．Lack of sleep on weekends.C．Vigorous exercise in th
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