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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填空题
Paragraph 2______.A. The invention of the fridge.B. The pollution caused by fridges.C. The widespread need for fridges.D. The days without the fridge.E. The waste of energy caused by fridges.F. The fridge’s contribution to commerce.
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.
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