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  3. If you want to increase your odds of having a long and lively lifetime, scientists say, work on getting an average of seven or e

If you want to increase your odds of having a long and lively lifetime, scientists say, work on getting an average of seven or e

admin2010-09-10  53
问题     If you want to increase your odds of having a long and lively lifetime, scientists say, work on getting an average of seven or eight hours of sleep a night. If you get only six hours or less, you stand a 70 percent chance of dying before your time.
    Scientists are finding that if you don’ t get enough sleep, you are putting yourself at increased risk of heart trouble, digestive disease, or a serious, even fatal (致命的) accident. When tired, your sight, hearing, and attention are slow to alert you to dangers--and once you are aware of them, your reactions are also slow.
    H. Craig Heller--a professor of biology at Stanford University--is one of a small army of scientists studying the reasons why many people can’ t sleep and wake refreshed, why the brain puts you to sleep, and why lack of sleep causes such powerful effects.
    Heller notes that most major accidents have occurred in the early morning, when workers probably were still sleepy from deficient (不足的) sleep. He includes the explosion at the nuclear power plant at Chernobyl in Ukraine, the release of poisonous gas at Bhopal, India and the nuclear accident at Three Mile Island in Pennsylvania.
    Scientists estimate that more than 100 million Americans have sleep troubles of some kind. Getting too little sleep heads the list. As many as one American in five gets fewer than six hours of sleep a night. Some people can get along on six hours, but most of us need between seven and eight--and children and young adults need up to 10 hours. As we age, it becomes more difficult to get enough sleep. At any age, however, we all can pile up a sleep deficit that eventual ly will force us to fall asleep-whether we’ re ready or not.
The author’ s purpose in writing this article is to ______.
选项 A、inform readers of Heller’ s findings in his researches
B、persuade readers to get enough sleep at different ages
C、show readers the importance of getting enough sleep
D、tell readers how many hours of sleep they should get
答案B
解析 写作意图题。根据第一段以及下文对睡眠不足的危害性以及对美国民众睡眠状况的分析，可知作者意在劝说读者每天要保证足够时间的睡眠，故答案为B。
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大学英语四级

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