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

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

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问题     Judging from recent surveys, most experts in sleep behavior 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【C1】________sleep than they ought to." says Dr. David.
    【C2】________people who think they are sleeping enough would probably be【C3】________with more rest.
    The beginning of our sleep deficit crisis can be【C4】________to the invention of the light bulb a century ago. From diary entries and other personal【C5】________from the 18th and 19th centuries, sleep scientists have reached the【C6】________that the average person used to sleep about 9.5 hours a night. "The best sleep habits once were【C7】________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【C8】________, 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【C9】________they’re doing it," says Dr. David. "They think they’re okay because they can【C10】________on 6.5 hours, when they really need 7.5, 8 or even more to feel ideally【C11】________."
    Perhaps the most merciless robber of sleep, researchers say, is the【C12】________of the day. Whenever pressures from work, family, friends and community【C13】________, many people consider sleep the least【C14】________item on the agenda.  "In our society, you’re considered【C15】________if you say you only need 5.5 hours’ sleep. If you say you’ve got to get 8.5 hours, people think you lack【C16】________and ambition."
    To assess the【C17】________of sleep deficit, researchers have put subjects【C18】________a set of psychological and performance tests requiring them, for instance, to add columns of numbers or recall a passage read to them only minutes earlier. "We’ve found that if you’re sleep-deprived, performance【C19】________," says Dr. David. "Short-term memory is impaired,【C20】________are abilities to make decisions and to concentrate."
【C9】
选项 A、accept
B、assure
C、realize
D、resolve
答案C
解析 前半句说到人们偷走了自己的睡眠时间，后一句提到他们觉得这么做没什么。由此可看出，他们并没有意识到他们的睡眠时间不够，故选C项realize“意识到”。从下一句的“他们觉得自己okay”可看出，他们是很能接受偷走睡眠时间这一行为的。而前面用了否定词don’t，A项accept“接受；采纳”不选。B项assure“向……保证，使确信”，无法与上下文联系，也不能选。D项resolve“解决”后接问题、争论、困难等，不接从句。
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