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  3. The normal human daily cycle of activity is of some 7-8 hours’ sleep alterna

The normal human daily cycle of activity is of some 7-8 hours’ sleep alterna

游客2023-07-29  22
问题     The normal human daily cycle of activity is of some 7-8 hours’ sleep alternation with sane 16-17 hours’ wakefulness and that the sleep normally coincides with the hours of darkness. Our present concern is with how easily and to what  【S1】______   this cycle can be modified.
    The question is no mere academic one. The ease with which people can change from working in the day to working at night is a matter of growing importance in industry where  【S2】______   calls for round-the-clock working of machines. It normally  【S3】______   from five days to one week for a person to adapt to a  【S4】______   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 means that no sooner has he got used to one routine  【S5】______   be has to change to another, so that much of his time is spent  【S6】______   working nor sleeping very  【S7】______  .
    One answer would seem to be longer periods on each shift, a month, or even three months. However, recent research has shown that people on such systems will  【S8】______   to go back to their normal habits of sleep and wakefulness during the weekend and that this is quite  【S9】______   to destroy any adaptation to night work built up during the week. The only real solution appears to be to hand over the night shift to those  【S10】______   night workers whose habit may persist through all week-ends and holidays.

A) reversed         B) quickly           C) than             D) extent
E) permanent        F) neither           G) revert           H) takes
I) level            J) automation        K) either           L) enough
M) efficiently      N) when              O) spends [br] 【S9】
选项
答案 L
解析 enough可放在动词、形容词和副词之后，不定式之前，表示“达到满意的程度，足够地，充足地”意思。这部分的大意是“……这足以改变这一周里已经适应的夜班工作”。
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