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  3. Judging from recent surveys, most experts in sleep behaviour agree that there is virtually an epidemic of sleepiness in the nati

Judging from recent surveys, most experts in sleep behaviour agree that there is virtually an epidemic of sleepiness in the nati

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问题     Judging from recent surveys, most experts in sleep behaviour agree that there is virtually an epidemic of sleepiness in the nation. "I can’t think of a single study that hasn’t found Americans getting less sleep than they ought to," says Dr. David. Even people who think they are sleeping enough would probably be better off with more rest.
    The beginning of our sleep-deficit crises can be traced to the invention of the light bulb a century ago. From diary entries and other personal accounts from the 18th and 19th centuries, sleep scientists have reached the conclusion that the average person used to sleep about 9.5 hours a night. "The best sleep habits once were forced on us, when we had nothing to do in the evening down on the farm, and it was dark." By the 1950s and 1960s, the sleep schedule had been reduced dramatically, to between 7.5 and eight hours, and most people had to wake to an alarm clock. "People cheat in their sleep, and they don’t even realize they’re doing it," says Dr. David. "They think they’re okay because they can get by on 6.5 hours, when they really need 7.5, eight or even more to feel ideally vigorous."
    Perhaps the most merciless robber of sleep, researchers say, is the complexity of the day. Whenever pressures from work, family, friends and community mount, many people consider sleep the least expensive item on his programme. "In our society, you’re considered dynamic if you say you only need 5. 5 hours’ sleep. If you’ve got to get 8. 5 hours, people think you lack drive and ambition."
    To determine the consequences of sleep-deficit, researchers have put subjects through a set of psychological and performance tests requiring them, for instance, to add columns of numbers or re call a passage read to them only minutes earlier. "We’ve found that if you’re in sleep deficit, performance suffers," says Dr. David. "Short-term memory is weakened, as are abilities to make decisions and to concentrate."
What is the main topic of the passage?
选项 A、Research on the consequences of sleep-deficit.
B、The epidemic of sleepiness in the modem times.
C、The history of people’s sleeping patterns.
D、The minimum of our sleeping hours.
答案B
解析 文章第一段点题：美国国内普遍存在的睡眠不足现象，接下来的几个段分别从睡眠不足的起因和结果来阐述这一主题。选项A)是对文章最后一个段的概括，不全面；选项C)只是在文章第二段有所提及，用比较的方法来说明现代人睡眠不足的现象，不是文章的主题；选项D)也只是在第二段中有所提及。
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