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
The difficulty in constructing tall buildings in the 19th century lies in
A. the shortage of money.
B. the lack of a device to carry people upward.
C. backward technology.
D. mountains taking up land space.
单项选择题
How the writer started smoking shows the powerful influence of
A. educational institutions
B. one’s social status
C. the mass media
D. public opinions
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