单项选择题

Different cultures have different communication ______

A．styles
B．signals
C．designs
D．symbols
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单项选择题
If you don't put the cheese in the refrigerator, it may ______.
A．go of
B．go out
C．go over
D．go wrong
单项选择题
It was not until an hour later that we heard ______ what had happened.
A．through
B．by
C．about
D．from
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