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."
【C13】

选项 A、enlarge
B、deepen
C、consolidate
D、mount

答案D

解析 句子表示“来自工作、家庭、朋友及社会的压力……”,由此可推测,睡眠时间少的原因,通常是压力过大或增长过快。D项mount意指“(尤指朝着使情况更糟的方向)渐渐增加,增长”,符合逻辑。A项enlarge指物体在大小、体积、宽度、长度、数量等方面的“增大,扩大”,不能用于修饰压力的增大。B项的deepen一般用来表示形势或情绪的“加剧”,不能与pressure搭配。而C项的consolidate一般指国家、团体、权利、成功等的“巩固,强化”,代入句中意思不通。
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