单项选择题

If a substance is dissolved in water or heated, it may ______ a gas.

A give into
B. give over
C. give off
D. give away
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单项选择题
Retirement is obviously a very complex ______ period; and the earlier you start planning for it, the better.
A．transition
B．transaction
C．transmission
D．transformation
单项选择题
Do have a cigarette, ______ you
A．can't
B．don't
C．wouldn't
D．won't
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