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
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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.
单项选择题
According to the passage, the words hold more (Line2, Para. 1 ) most probably mean______.
A．keep more in the store
B．give more rights
C．keep more interested
D．maintain more chances
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