单项选择题

Gas does accumulate in the mines around here.

A．increase
B．spread
C．collect
D．grow
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单项选择题
Since the Great Depression, the United States government has protected farmers from damaging drops in grain prices.
A．slight
B．surprising
C．sudden
D．harmful
单项选择题
Many fine cooks insist on ingredients of the highest quality.
A．demand
B．rely on
C．prepare for
D．create
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