单项选择题

Desert plants ______ two categories according to the way they deal with the problem of surviving drought.

A．break down
B．fall into
C．differ in
D．refer to
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单项选择题
There is only one difference between an old man and a young one: the young one has a glorious future before him and the old one has a ______ future behind him.
A．splendid
B．conspicuous
C．uproarious
D．imminent
单项选择题
Haven't I told you I don't want you keeping ______ with those awful riding-about bicycle boys
A．company
B．acquaintance
C．friends
D．place
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