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 arrange for some people to work on night shifts only
D．to create better living conditions for night workers
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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 changes of routine.
D．Disturbed sleep occurs less frequently among those on permanent night or day shifts.
单项选择题
It is possible to find out if a person has adapted to the changes of routine by measuring his body temperature because ______.
A．body temperature changes when the cycle of sleep and wakefulness alternates
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 temperatures when they are working efficiently
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