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.
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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
The examples in Para. 5 are given by the author to______.
A．prove the high technology has a promising future
B．to support his assumption of new type of teamwork in the preceding paragraphs
C．to show that it tends to be an end to teamwork soon
D．to indicate the computer-assisted team effort just means investigation and simulation
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