单项选择题

If headaches only occur at night, lack of fresh air is often the cause.

A．deliver
B．fall
C．happen
D．arrive
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单项选择题
The researchers have just completeda study of driving situations.
A．started
B．finished
C．changed
D．made
单项选择题
In order to surviveman needs to consume food and water.
A．work
B．play
C．live
D．walk
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