单项选择题

It's harmful to one's health to _______ smoking and drinking.

A．take on
B．take in
C．take to
D．take off
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单项选择题
In order to ______ a good knowledge of English, he gave up his job and went to study in an English school.
A．require
B．inquire
C．acquire
D．address
单项选择题
Chinese meteorologists on Wednesday said the development of China's own climate system model was ______ to its national security strategy.
A．crucial
B．inventive
C．innovative
D．systematic
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