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.
【C2】
选项
答案I
解析 由空格前的a可确定空格处应填入可数名词单数。上一句说“这不仅仅是一个学术问题”可推知空格所在句是对上一句的展开说明，进一步对这个问题进行定性，所以空格处应该填入一个和question意思相近的词，词库中的problem和matter初步符合条件。本句的主语“人们能否轻易地从白天工作改为晚上工作”是对某事的可能性的探讨，属于一件需要思考的事情，matter作“事情，问题”解的时候，通常侧重指“人们考虑和关心的事和话题”，符合此处语境，故选I。problem也表“问题”，强调难以理解的，给人造成困难的事情，不符合此处语境。
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