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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Not everyone can perceivethe gradual change in the writer s style.
A．notice
B．describe
C．appreciate
D．see
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We ve seen a markedshift in our approach to the social issues.
A．clear
B．regular
C．quick
D．great
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