21. 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(A)
22. 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.(C)
23. 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.(A)
24. 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
考试用书 C) keep in constant touch with the computer center
D) inform the system of his destination by phone(D)
25. What is the author’s attitude toward the future of autos?
A) Enthusiastic.
B) Pessimistic.
C) Optimistic.
D) Cautious.(C)