专四
The normal human daily cycle of activity is of some 7-8 hours' sleep alternation with some 16-17 hours' wakefulness and that the sleep normally coincides (31)______ the hours of darkness. Our present (32) ______ is with how easily and to what extent this (33) ______ can be modified.
The question is no mere academic one. The ease (34) ______ people can change from working in the day to working at night is a (35) ______of growing importance in industry where automation (36) ______ round-the-clock working of machines. It normally (37) ______ from five days to one week for a person to (38)______ to a (39)______ routine of sleep and wakefulness, sleeping during the day and working at night. (40) ______, 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 (41) ______ he has to change to another, (42)______ much of his time is spent neither working nor sleeping very (43)
One answer would seem to be (44) ______ periods on each shift, a month, or even three months. (45) _______, recent research has shown that people on such systems will revert to go back to their (46) ______ habits of sleep and wakefulness during the weekend and that this is quite enough to destroy any (47) ______ to night work built up during the week. The only real solution appears to be to (48) ______ the night shift to those (49) ______ night workers whose (50)______ may persist through weekends and holidays._________填上最佳答案。
A．in
B．with
C．of
D．over
【点睛】词汇搭配线索题。选项C、D不与coincide搭配。
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