单项选择题

To decrease the number of useless car trips, you can use the ______.

A．bus service
B．subway service
C．telephone
D．airplane
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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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