stem\rD. its seating capacity\rWhat is the author's main concern?\rA. How to make automobiles pollution-free.\rB. How to abandon automobiles in the future.\r区 C. How to solve the problem of traffic jams.\r厂 D. How to develop a computerized subway system.\r13. What provides autos with electric power in a computerized\rhighway system?\r_ A. A rail.\rB. An engine.\rC. A retractable arm.\rD. A computer controller.\rIn a computerized highway system, all the driver needs to do\ri s .\rA. keep in the right lane\rB. wait to arrive at his destination\rC. keep in constant touch with the computer center\rD. inform the system of his destination by phone\rWhat is the author's attitude toward the future of autos?\rA. Enthusiastic.\rB. Cynical.\rC. Optimistic.\rD. Cautious.
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