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
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We shall take the treasure away to a safe place.
A．clean
B．pretty
C．distant
D．secure
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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