单项选择题

Mr. Smith has to go to Beijing on business, ______

A．hasn't he
B．has he
C．isn't he
D．doesn't he
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单项选择题
According to the passage,______.
A．early man did not know how to make use of trees
B．tree are not as useful now as they were in the past
C．trees were more useful in the past than they are now
D．men have always found trees useful
单项选择题
According to the passage some desert areas were once ______.
A．fertile lands
B．covered by rivers
C．very cold
D．very dry and useless lands.
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