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  3. Throughout history man has observed such natural cycles as the rising and setting of the sun, the ebb and flow of the ocean tide

Throughout history man has observed such natural cycles as the rising and setting of the sun, the ebb and flow of the ocean tide

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问题     Throughout history man has observed such natural cycles as the rising and setting of the sun, the ebb and flow of the ocean tides, and the changes of the seasons. The【C1】______nature of these events provided people with a measure of【C2】______about things to come and give them reason to reflect on their past and plan for their future. The regularity of such social activities as work hours, meal times, and holiday schedules【C3】______the extent to which human activity itself is organized in cycles.
    Recently,【C4】______effort has been spent investigating the effect of various biological rhythms in the human body.【C5】______, interest in these rhythms at least in part results from man’s basic desire to predict future behavior.
    The human body【C6】______a number of repeatable rhythms: heartbeats, breathing rates, brain waves and other physiological processes within the human machine.
    Scientists studying rhythms in humans have measured sleep patterns and attention【C7】______over periods of several days, and have【C8】______the fact that the cycles exist and exert effects on physiological and sociological behavior. A common example is jet lag. A person’s traveling in the east-west direction across time zones【C9】______his sleep cycles—it may take several days to return to the【C10】______cycle or to readjust to a new one.
A)indicates B)demonstrated C)verifying D)normal
E)considerable F)upsets G)disappoints H)periodic
I)Certainly J)Thankfully K)spans L)gorgeous
M)security N)exhibits O)limits
【C2】
选项
答案M
解析 根据空格前的介词of，可知空格应填人名词或动名词作宾语。a measure of在此用作数量词，相当于anamount of，下文谈到了这些自然现象周期变化的规律性对人们安排行为活动的影响。换句话说，这些现象的周期性让人们能够撑控即将到来的事物。词库中只有security“安全感”放人句中后句意通顺。
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