单项选择题

The best solution for implementing the 24-hour working system seems to be ______.

A．to change shifts at longer intervals
B．to have longer shifts
C．to employ people who work on night shifts only
D．to create better living conditions for night workem
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单项选择题
Why is the question of how easily people can get used to working at night no mere academic
A．Because few people like to reverse the cycle of sleep and wakefulness.
B．Because sleep normally coincides with the hours of darkness.
C．Because people are required to work at night in some fields of industry.
D．Because shift work in industry requires people to change their sleeping habits.
单项选择题
Which of the following statements is not true
A．Body temperature may serve as an indication of a worker’s performance.
B．The selection of a number of permanent night shift workers has proved to be the best solution to problems of the round-the-clock working system.
C．Taking body temperature at regular intervals can show how a person adapts to the change of routine.
D．Disturbed sleep occurs less frequently among those on permanent night or day shifts.
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