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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单项选择题
We also want to use the water to irrigate barren desert land.
A．hairless
B．bare
C．empty
D．smooth
单项选择题
There is an abundant supply of cheap labor in this country.
A．a steady
B．a plentiful
C．an extra
D．a meager
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