单项选择题

Any troop of wild animals should be approached warily.

A. fearlessly
B. confidently
C. silently
D. prudently
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单项选择题
He masked his fear by a show of confidence.()

A. demonstrated
B. betrayed
C. put up with
D. concealed
单项选择题
You must be tired, but try to hang on till all the work’s finished（）．

A． stop working
B． keep working
C． wait
D． rest
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