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  3. Sleep Deficit(不足) Judging from recent surveys, most experts in sleep behavior agree that is virtually an epidemic of sleepin

Sleep Deficit(不足) Judging from recent surveys, most experts in sleep behavior agree that is virtually an epidemic of sleepin

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问题                           Sleep Deficit(不足)
    Judging from recent surveys, most experts in sleep behavior agree that 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 crisis can be traced to the invention of the light bulb a century ago. From diary entries and other personal accounts from the 18th 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, that sleep schedule had been reduced dramatically, to between 7. 5 and 8 hours, and most people had to wake to an alarm clock. "People cheat on 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, 8 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 program. "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 page read to them only minutes earlier. "We’ve found that if you’re in sleep deficit, performance suffers, " says Dr. David. "Shot-term memory is weakened, as are abilities to make decision and to concentrate.
Many Americans believe that ______.
选项 A、sleep is the first thing that can be sacrificed when one is busy
B、they need more sleep to cope with the complexities of everyday life
C、to sleep is something one can do at any time of the day
D、enough sleep promotes people’s drive and ambition
答案A
解析 推断题。根据第三段内容可知，美国人往往减少睡眠时间的方式来处理生活中的事情，因为睡眠是最不重要的(the least expensive item)。因此，A符合文意。B“需要更多的睡眠去应对生活压力”与文意正好相反；C“一天任何时候都可以用来睡觉”和D“充足的睡眠可以提升精力和野心”文中没有提及。
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