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
This article means to say that a careful driver travels about （）

A．75 miles per hour
B．65 miles per hour
C．55 miles per hour
D．10 miles per hour
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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