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
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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
单项选择题
By comparing past problems with present ones, the author draws attention to _________.
A．the significance of this crisis
B．the inadequacy of governments
C．the similarity of the past to the present
D．the hopelessness of the situation
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