大学英语六级考试真题演练(第22期)单选36to40

CET6：大学英语六级考试真题演练(第22期)

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单选

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36 to 40 are based on the . #

We all know that the human daily cycle of is of some 7-8 hours’ sleep with some 16-17 hours’ and that, , the sleep with the hours of . Our is with how and to what this cycle can be . #

The is no mere one. The ease, for , with which can from in the day to at night is a of in where calls for round-the-clock of . It takes from five days to one week for a to adapt to of sleep and , the day and at night. , it is often the case in that are every week; a may work from 12 to 8 a.m. one week,8 a.m. to 4 p.m. the next六级考试真题, and 4 p.m. to 12 the third and so on. This means that no has he got used to one than he has to to , so that much of his time is spent nor very .

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The only real to be to hand over the night shift to a of night . An study of the life and of night-shift was out by Brown in 1957. She found a high (发生率) of sleep and other among those on day and night ,but no of these among those on night work. #

This then to be the best long-term六级考试真题, but may be done to the of day and night work by those who can adapt most to the of . One way of when a has is by his body . in work will have a high the hours of and a low one at night; when they to night work the will only go back to match the new and the speed with which it does so , , the of the body as a whole, in terms of . , by body at of two hours the of it can be seen how a can adapt to a , and this could be used as a basis for . So far, , such a form of does not seem to have been in .

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36.Why is the of “how can get used to at night” not a mere ?

A) few like to the cycle of sleep and .

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B) sleep with the hours of .

C) are to work at night in some of .

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D) shift work in to their .

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37.The main of the round-the-clock lies in .

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A) the about to the by the of #

B) the of the daily life cycle of who have to too #

C) the fact that at night are often less

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D) the fact that it is to find a of good night #

38.The best for the 24-hour seems to be .

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A) to at

B) to have #

C) to for some to work on night only

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D) to for night

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39.It is to find out if a has to the of by his body . #

A) body when the cycle of sleep and #

B) body when he to night shift or back

C) the when the is

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D) have when they are #

40.Which of the is NOT TRUE? #

A) Body may serve as an of a ’s .

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B) The of a of night shift has to be the best to of the round-the-clock . #

C) body at can show how a to the of .

D) sleep less among those on night or day . #