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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 _1_ the hours of darkness. Our present _2_ is with how easily and to what extent this _3_ can be modified.
The question is no mere academic one. The ease _4_ which people can change from working in the day to working at night is a _5_ of growing importance in industry where automation _6_ round-the-clock working of machines. It normally _7_ from five days to one week for a person to adapt to a _8_ routine of sleep and wakefulness, sleeping during the day and working at night. _9_, it is often the case in industry that _10_ are changed every week. This means that no sooner has he got used to one routine _11_ he has to change to another, _12_ much of his time is spent neither working nor sleeping very _13_.
One answer would seem to be _14_ periods on each shift, a month, or even three months. _15_, recent research has shown that people on such systems will revert to go back to their _16_ habits of sleep and wakefulness during the weekend and _17_ this is quite enough to destroy any _18_ to night work built up during the week. The only real solution appears to be to hand _19_ the night shift to those permanent night workers whose _20_ may persist through all weekends and holidays.

问题1选项
A.in
B.with
C.of
D.over
问题2选项
A.issue
B.concern
C.advantage
D.problem
问题3选项
A.cycle
B.period
C.circle
D.round
问题4选项
A.at
B.from
C.with
D.for
问题5选项
A.problem
B.difficulty
C.trouble
D.matter
问题6选项
A.asks
B.invites
C.calls for
D.reacts to
问题7选项
A.takes
B.spends
C.demands
D.asks
问题8选项
A.former
B.returned
C.reversed
D.regular
问题9选项
A.Therefore
B.Unfortunately
C.In a word
D.In comparison
问题10选项
A.shifts
B.plans
C.turns
D.arrangements
问题11选项
A.as
B.when
C.then
D.than
问题12选项
A.though
B.so that
C.while
D.as
问题13选项
A.efficiently
B.good
C.easily
D.happily
问题14选项
A.shorter
B.better
C.longer
D.nicer
问题15选项
A.So
B.In short
C.Similarly
D.However
问题16选项
A.new
B.normal
C.temporary
D.favourite
问题17选项
A.then
B.yet
C.that
D.so
问题18选项
A.change
B.return
C.adaptation
D.tendency
问题19选项
A.out
B.down
C.to
D.over
问题20选项
A.wakefulness
B.sleep
C.preference
D.habit
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