单项选择题

According to the passage, the best solution on the problem seems to be______.

A．not to change shifts from one week to the next
B．to make periods on each shift longer
C．to employ people who will always work at night
D．to find ways of selecting people who adapt quickly
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单项选择题
The question raised in Para. 1 is no mere academic one because______.
A．Bonjer's findings are different from Brown's.
B．sleep normally coincides with the hours of darkness.
C．some people can change their sleeping habits easily.
D．shift work in industry requires people to change the sleeping habits.
单项选择题
Which of the following is TRUE
A．Machines can help solve the problem of working at night.
B．A person can work more efficiently by frequent changes between day shifts and night shifts.
C．C ) The adaptation to night work can be destroyed if the persons return to normal habits.
D．Permanent night workers are more likely to have such symptoms as digestive disorder.
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