单项选择题

What provides autos with electric power in an automated highway system ______.

A．A rail
B．An engine
C．A retractable arm
D．A computer controller
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单项选择题
In an automated highway system, all the driver needs to do is______.
A．keep in the right lane
B．wait to arrive at his destination
C．keep in constant touch with the computer center
D．inform the system of his destination by phone
单项选择题
One significant improvement in the future car will probably be______.
A．its power source
B．its driving system
C．its monitoring system
D．its seating capacity
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