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We all know that the normal human daily cycle of activity is of some 7-8 hours’ sleep alternating 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 industry 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 midnight to 8 a.m. one week, 8 a.m. to 4 p.m., the next, and 4 p.m. to 12 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.
One answer would seem to be longer period on each shift, a month, or even three months. Recent research by Bonjer of the Netherlands, however, has shown that people on such systems will revert to their normal habits of sleep and wakefulness during the weekend and that is quite enough to destroy any adaption to night work built up during the week.
The only real solution appears to be to hand over the night shift to a corps of permanent night workers whose nocturnal(夜间发生的)wakefulness may persist through all weekends and holidays. An interesting study of the domestic life and health of night-shift workers was carried out by Brown. She found a night incidence of disturbed sleep, digestive disorder and domestic disruption among those on alternating day and night shifts, but no abnormal occurrence of these symptoms among those on permanent night work.
1. Why is the question “no mere academic one’’?
2. According to the passage, the main problem about night work is that ( ).
3. According to the passage, the best solution to the problem seems to be ( ).
4. In Paragraph 2, “the third” means ( ).
5. In the last sentence of Pragraph 2, “another” means ( ).

问题1选项
A.Because Bonjer’s findings are different from Brown’s.
B.Because sleep normally coincides with the hours of darkness.
C.Because some people can change their sleeping habits easily.
D.Because shift work in industry requires people to change their sleeping habits.
问题2选项
A.people hate the inconvenience of working on night shifts
B.your life is disturbed by changing from day to night routines and back
C.not all industries work at the same hours
D.it is difficult to find a corps of good night workers
问题3选项
A.not to change shifts from one week to the next
B.to make periods on each shifts longer
C.to employ people who will always work at night
D.to find ways of selecting people who adapt quickly
问题4选项
A.the third week
B.the third shift
C.a third of the time
D.the third routine
问题5选项
A.another routine
B.another shift
C.another week
D.another person
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