单项选择题

A．Having a rest.
B．Looking for something.
C．Climbing a hill.
D．Going down a hill.
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单项选择题
In some countries more and more young people now need ______ teeth.
A．false
B．spare
C．untrue
D．unnatural
单项选择题
Trains stop here in order to ______ passengers only.
A．get off
B．pull up
C．get on
D．pick up
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