单项选择题

According to the passage, the best solution to 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
Which of the statement is true
A．Automation helps solve the problem of working at night.
B．A person can work more efficiently by frequent changes between day shifts and night shifts.
C．The adaptation to night work can be destroyed if the persons revert to their normal habits for even one day or two.
D．Those permanent night workers are more likely to have such symptoms as digestive disorder.
单项选择题
The article is mainly about ______.
A．how the normal human daily cycle works
B．how to deal with the problem of shift work
C．a research on the normal human daily cycle
D．how to work better
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