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
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
单项选择题
In the airport, I could hear nothing except the roar of aircraft engines which ______ all other sounds.
A．dwarfed
B．diminished
C．drowned
D．devastated
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