单项选择题

What is the author's attitude toward the future of autos

A．Enthusiastic.
B．Pessimistic.
C．Optimistic.
D．Cautious.
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单项选择题
What is the author's main concern
A．How to render automobiles pollution- free.
B．How to make smaller and safer automobiles.
C．How to solve the problem of traffic jams.
D．How to develop an automated subway system.
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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