单项选择题

Water, when boiled, always _________ steam.

A．give in
B．gives up
C．gives off
D．gives away
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单项选择题
The rich natural _________ of North America helped give rise to the industries that would meet these needs.
A．sources
B．resources
C．materials
D．matter
单项选择题
When Mr. White left the classroom, all of the students roared with _________.
A．sneer
B．smile
C．giggle
D．laughter
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