2. 考研
  3. The normal human daily cycle of activity is of some 7-8 hours’sleep【C1】______with some16~17 hours’wakefulness and that the sleep

The normal human daily cycle of activity is of some 7-8 hours’sleep【C1】______with some16~17 hours’wakefulness and that the sleep

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问题     The normal human daily cycle of activity is of some 7-8 hours’sleep【C1】______with some16~17 hours’wakefulness and that the sleep normally coincides【C2】______the hours of darkness. Our present【C3】______is with how easily and to what extent this【C4】______can be modified.
    The question is no mere academic one . The ease with【C5】______people can change from working in the day to working at night is a【C6】______of growing importance in industry where automation【C7】______round-the-clock working of machines. It normally【C8】______from five days to one week for a person to adapt to a【C9】______routine of sleep and wakefulness, sleeping【C10】______the day and working at night.【C11】______it is often the case in industry that shifts are changed every week. This【C12】______that no sooner has he got used to one routine【C13】______he has to change to another,【C14】______much of his time is spent neither working nor sleeping very【C15】______.
    One answer would seem to be【C16】______periods on each shift, a month, or even three months. 【C17】______, recent research has shown that people on such systems will revert to go back to their【C18】______habits of sleep and wakefulness during the week-end and that this is quite enough to destroy any【C19】______to night work built up during the week. The only real solution appears to be to hand over the night shift to those permanent night workers whose【C20】______may persist through all weekends and holidays.
【C17】
选项 A、However
B、Similarly
C、In short
D、So
答案A
解析 本题考查对上下文的理解。前文提到了较长的转换期，这相对于一个星期来说会好一些，但它同样有不足之处。，前后为转折关系。而选项B，C，D都不表示转折关系，所以选A。
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