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
The main problem of the round-the-clock working system lies in ______.
A．the inconveniences brought about to file workers by the introduction of automation
B．the disturbance of daily life cycle of workers who have to change shifts too frequently
C．the fact that people working at night are often less effective
D．the fact that it is difficult to find a number of good night workers
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.
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