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
Cement was seldom Used in buildings in the Middle Ages.
A. crudely
B. rarely
C. originally
D. occasionally
单项选择题
The most crucial problem any economic system faces is how to use its scarce resources.
A. puzzling
B. difficult
C. terrifying
D. urgent
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