单项选择题

Fuel scarcities and price increases（） automobile designers to scale down the largest models and to develop completely new lines of small cars and trucks.

A. persuaded
B. prompted
C. imposed
D. enlightened

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单项选择题
（37）（）

A. with
B. of
C. for
D. to
单项选择题
Researchers discovered that plants infected with a virus give off a gas that（）disease resistance in neighboring plants.

A. contracts
B. activates
C. maintains
D. prescribe
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