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
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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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