单项选择题

By moving the radar beam around slowly in circles, we can ______ the surroundings.

A．explore
B．expose
C．exploit
D．expand
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单项选择题
The clock ______ and we realized it was two o'clock.
A．hit
B．struck
C．knocked
D．rang
单项选择题
Children who are over-protected by their parents may become
A．hurt
B．damaged
C．spoiled
D．harmed
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