单项选择题

The average number of hours of sleep that an adult needs is ______.

A．approximately six hours
B．around ten hours
C．about eight hours
D．not stated here
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单项选择题
Which of the following statements best describes the organization of the pas- sage
A．A statement illustrated by an analogy(类比).
B．A hypothesis supported by documentation(引用文献).
C．A comparison of two contrasting theories.
D．A critical analysis of a common assumption.
单项选择题
The author says children in the city seldom went to the woods and the fields because ______.
A．all these places were too far away for them to go
B．it was impossible for them to go and get back in one day
C．they were not old enough to take such a trip
D．they were not permitted to go to these places
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