单项选择题

Cement was seldom used in building during the Middle Ages.

A．crudely
B．rarely
C．originally
D．symbolically
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单项选择题
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
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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