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.

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热门试题

单项选择题

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

A．Enthusiastic.
B．Pessimistic.
C．Optimistic.
D．Cautious.

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