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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单项选择题

In the second paragraph, the third means ______.

A．the third week
B．the third shift
C．a third of the time
D．the third routine

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.