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

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.
【C10】
选项
答案N
解析 空格前的whose提示空格需填入名词。上文提到“无论是每月一轮还是每三个月一轮，人们都会在周末恢复到正常的睡眠和清醒习惯(habits)”，空格所在句说那些长期值晚班的人才是真正解决问题的关键，由此可见他们的作息习惯在周末和节假日都能保持不变，因此空格处应填入habit。
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