单项选择题

You should keep it in the icebox, ______ it will go bad.

A．and
B．or
C．but
D．so
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单项选择题
This answer sounded ______.
A．correct
B．correctly
C．nicely
D．interested
单项选择题
Water, when boiled, always ______ steam.
A．gives in
B．gives up
C．gives off
D．gives away
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