2. 财经
  3. We all know that the normal human daily cycle of activity is of some 7-8 hours’sleep alternation with some 16—17 hours’wakefulne

We all know that the normal human daily cycle of activity is of some 7-8 hours’sleep alternation with some 16—17 hours’wakefulne

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问题 We all know that the normal human daily cycle of activity is of some 7-8 hours’sleep alternation with some 16—17 hours’wakefulness and that，broadly speaking，the sleep normally coincides with the hours of darkness．Our present concern is with how easily and to what extent this cycle can be modified． The question is no mere academic one．The ease，for example，with which people can  change from working in the day to working at night is a question of growing importance in in—dustry where automation calls for round—the—clock working of machines．It normally takes from five days to one week for a person to adapt to a reversed 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；a person may work from 12：00 midnight to 8：00 a．m．one  week，8：00 a．m．to 4：00 P．m．the next，and 4：OOp．m．to 12：00 midnight the third and so on．
  This means that no sooner has he got used to one routine than he has to change to another，so  that much of his time is spent neither working nor sleeping very efficiently． The only real solution appears to be to hand over the night shift to a number of Dermanent  night workers．An interesting study of the domestic life and health of night—shift workers was  carried out by Brown in 1957．
She found a high incidence of disturbed sleep and other disorders  among those on alternating day and night shifts，but no abnormal occurrence of these phenomena among those on permanent night work．
This latter system then appears to be the best long—term policy，but meanwhile something  may be done to relieve the strains of alternate day and night work by selecting those people  who can adapt most quickly to the changes of routine．
One way of knowing when a person has  adapted is by measuring his body temperature．People engaged in normal daytime work will  have a high temperature during the hours of wakefulness and a low one at night；when thev  change to night work，the pattern will only gradually go back to match the new routine and  the speed with which it does so parallels，broadly speaking，the adaptation of the body as a  whole，particularly in terms of performance．Therefore，by taking body temperature at interyals of two hours throughout the period of wakefulness it can be seen how quicklv a Person  can adapt to a reversed routine，and this could be used as a basis for selection．So far。however，such a form of selection does not seem to have been applied in practice．
It is possible to find out if a person has adapted to the changes of routine by measuring his body temperature because．
选项 A、body temperature changes when the cycle of sleep and wakefulness aIternates
B、body temperature changes when he changes to night shift or back
C、the temperature reverses when the routine is changed
D、people have higher temperature when they are working efficiently
答案C
解析 推理引申题。最后一段指出体温与人处于醒着的状态还是睡眠状态的关系，只有C与原文相符。
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