单项选择题
In many buildings hot water ______ through pipes to keep rooms warm.
A．penetrates
B．circulates
C．chokes
D．surrounds
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单项选择题
When her rival died, she ______a grief she did not feel.
A．counteracted
B．counterchecked
C．counterfeited
D．counterchanged
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单项选择题
______in conversation, we did not see him go out,
A．Engaged
B．Enraptured
C．Enraged
D．Encouraged
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