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
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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
单项选择题
The _________ came from the chairman that the regulations be adopted.
A．motion
B．movement
C．promotion
D．motive
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