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
Please give my best __________ to your family.
A．notice
B．attention
C．regards
D．cares
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Water, when boiled, always _________ steam.
A．give in
B．gives up
C．gives off
D．gives away
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