单项选择题

He received a(n) _________ letter threatening to disclose his affair with that woman.

A．ambiguous
B．vigorous
C．anonymous
D．autonomous
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单项选择题
The young man _________ from his normal good habits by becoming drunk once.
A．deviated
B．detached
C．derived
D．descended
单项选择题
Science is the systematic _________ of knowledge using nature itself or laboratory models and experiments.
A．pursuit
B．acquisition
C．exploitation
D．survey
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