A. so that B. preference C. normal D. circle E. calls for F. problem G. longer

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问题    A. so that       B. preference       C. normal       D. circle       E. calls for
F. problem       G. longer          H. cycle       I. matter       J. illustrates
K. hand over    L. formal          M. reversed    N. habit       O. means
The normal human daily cycle of activity is some 7-8 hours’ sleep alternation with some 16-17 hours’ wakefulness and that the sleep normally coincides with the hours of darkness. Our present concern is how easily and to what extent this【C1】________can be modified.
The question is not merely an academic one. The ease with which people can change from working in the day to working at night is a【C2】________ of growing importance in industry where automation【C3】________ round-the-clock working of machines. It normally takes from five days to one week for a person to adapt to a【C4】________routine of sleep and wakefulness, sleeping during the day and working at night. Unfortunately, it is often the case in industry that shifts are changed every week. This【C5】________ that no sooner has he got used to one routine than he has to change to another,【C6】________much of his time is spent neither working nor sleeping very efficiently.
One answer would seem to be【C7】________periods on each shift, a month, or even three months. However, recent research has shown that people on such systems will go back to their【C8】________ habits of sleep and wakefulness during the weekend and that this is quite enough to destroy any adaptation to night work built up during the week. The only real solution appears to be to【C9】________the night shift to those permanent night workers whose【C10】________ may persist through all weekends and holidays.
【C4】

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答案M

解析空格前为a，空格后为可数名词单数routine，因此空格处应填入形容词或分词，修饰routine。空格后提到sleeping during the day and working at night“白天睡觉、晚上工作”，这种工作模式和正常的工作模式刚好相反，因此填入词库中的reversed“颠倒的”。

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专业英语四级

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