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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."
【C12】
选项 A、simplicity
B、complexity
C、diversity
D、efficiency
答案B
解析 本句解释了睡眠被无情夺走的原因。由下文“来自工作、家庭、朋友及社会的压力”，可知填入的名词具有消极的意义。结合选项可知B项complexity“错综复杂”符合句意，表示睡眠被无情夺走的原因是每天各种事务错综复杂。如果每天的生活都很简单，睡眠就不会被轻易夺走，A项simplicity“简单，朴实”首先可排除。C项diversity“多样性”是褒义词，用在这里表明“每一天都是很多样化的”。而下文中的各种压力只是生活中的一面。D项efficiency“效率”是中性词，如果是高效率的生活则会更轻松，睡眠会更好，故也不准确。
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