2. 考研
  3. The Earth’s daily clock, measured in a single revolution, is twenty-four hours. The human clock,【C1】______, is actually about tw

The Earth’s daily clock, measured in a single revolution, is twenty-four hours. The human clock,【C1】______, is actually about tw

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问题     The Earth’s daily clock, measured in a single revolution, is twenty-four hours. The human clock,【C1】______, is actually about twenty-five hours. That’ s 【C2】______ scientists who study sleep have determined from human subjects who live for several weeks in observation chambers with no【C3】______of day or night. Sleep researchers have【C4】______other surprising discoveries as well.
We spend about one-third of our lives asleep, a fact that suggests sleeping, 【C5】______eating and breathing, is a fundamental life process. Yet some people almost never sleep, getting by on as 【C6】______as fifteen minutes a day. And more than seventy years of【C7】______ into sleep deprivation, in which people have been kept 【C8】______for three to ten days, has【C9】______ only one certain finding: Sleep loss makes a person sleepy and that’ s about all; it causes no lasting ill【C10】______ . Too much sleep, however, may be 【C11】______ for you.
    These findings【C12】______some long-held views of sleep, and they【C13】______questions about its fundamental purpose in our lives. In【C14】______, scientists don’t know just why sleep is necessary.
    Some scientists think sleep is more the result of evolutionary habit than【C15】______actual need, Animals sleep for some parts of the day perhaps because it is the 【C16】______thing for them to do: it keeps them【C17】______ and hidden from predators; it’s a survival tactic. Before the advent of electricity, humans had to spend at least some of each day in【C18】______and had little reason to question the reason or need for【C19】______. But the development of the electroencephalograph and the resulting discovery in 1937 of dramatic【C20】______ in brain activity between sleep and wakefulness opened the way for scientific inquiry in the subject.
【C13】
选项 A、evade
B、settle
C、raise
D、release
答案C
解析 考查动词辨析。此处句意为“这些发现质疑了一些关于睡眠长期持有的观点，也______了有关睡眠在我们生命中基本作用的问题”。C．raise“提起，提出(问题、反对等)”符合题意，为正确答案。evade“躲避，避开”，settle“解决，安排”，release“释放，放出”均不符合题意，故排除。
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