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 ann.
D．A computer controller.
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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
单项选择题
By saying that the bomb also has a deterrent effect the spokesman means that it ______
A．will frighten away any possible intruders
B．can show the special status of its owners
C．will threaten the safety of the owners as well
D．can kill those entering others' houses by force
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