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
An exhaustive investigation of the facts proves the contrary.
A．exhausted
B．tired
C．thorough
D．careful
单项选择题
We had a very awful earthquake here last year.
A．light
B．terrible
C．slight
D．obvious
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