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 arm
D．A computer controller
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