单项选择题

What is the main idea of the passage

A．Americans need to save gas.
B．Gas prices continue to rise.
C．Small cars get good gas mileage.
D．Automobiles cause serious air pollution.
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单项选择题
If more people shared a ride, there would be ______.
A．fewer cars on the road
B．higher insurance rates
C．more highway accidents
D．more cars on the road
单项选择题
The author suggests that better driving habits （）

A．are required by law
B．will not cause any accidents
C．help to keep the car in good shape
D．help save gas
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