单项选择题

A．from
B．down
C．outside
D．back
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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 ) 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.
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 ) 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
A．beforeB．becauseC．whenD．since
A．before
B．because
C．when
D．since
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