单项选择题

Having said he would mend the clock, he discovered he had not brought the right __________ for the job.

A．tools
B．instruments
C．material
D．apparatus
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单项选择题
Skydiving, a difficult and dangerous sport, is very popular _________ both men and women in the United States.
A．among
B．to
C．in
D．with
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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