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  3. The Earth’ s daily clock, measured in a single revolution, is twenty-four hours. The human clock,【C1】______, is actually about t

The Earth’ s daily clock, measured in a single revolution, is twenty-four hours. The human clock,【C1】______, is actually about t

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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.
【C1】
选项 A、however
B、otherwise
C、likewise
D、therefore
答案A
解析 考查逻辑关系。此处句意为“以一次单独的旋转来测量，地球每天的时钟是24小时。______，人类的时钟实际大约是25小时。”根据上下文的意思以及提示词actually，可以判断出本句与上句是转折关系。所以，正确答案是A．however。otherwise“否则，不然”，likewise“照样，而且”，therefore“总之，因此”，均不符合题意。
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考研英语一

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