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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Medicine depends on other fields for basic information, particularly some of their specialized branches.
A. conventionally
B. obviously
C. especially
D. inevitably
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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