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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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
单项选择题
In no ______ should you do this without help and advice from your doctor--restricting the diet of small children can be very dangerous.
A．perspectives
B．restrictions
C．circumstances
D．consequences
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