Somepessimisticexpertsfeelthatautomobile(汽車)isgoingtofa...

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問題詳情：

Some pessimistic experts feel that automobile (汽車) is going to fall into disuse. They see a day in the not-too-distant future when all autos will be abandoned and allowed to rust. Other authorities, however, think the auto is here to stay. They hold that the car will remain a leading means of urban travel in the foreseeable future.

The motorcar will undoubtedly change significantly over the next 30 years. It should become smaller, and more economical, and should not be powered by the gasoline engine. The car of the future should be far more pollution-free than present types.

Regardless of its power source, the auto in the future will still be the main problem in urban traffic congestion (擁擠). One proposed solution to the problem is the automated highway system.

When the auto enters the highway system, a retractable (可伸縮的) arm will drop from the auto and make contact with a rail, which is similar to those powering subway trains electrically. Once attached to the rail, the car will become electrically powered from the system, and control of the vehicle will pass to a central computer. The computer will then monitor all of the car’s movements.

The driver will use a telephone to dial instructions about his destination into the system. The computer will calculate the best route, and reserve space for the car all the way to the correct exit from the high way. The driver will then be free to relax and wait for the buzzer (蜂鳴器) that will warn him of his coming exit. It is estimated that an automated highway will be able to handle 10,000 vehicles per hour, compared with the 1,500 to 2,000 vehicles that can be carried by a present-day highway.

28. One significant improvement in the future car will be ______.

A. its power source B. its driving system

C. its monitoring system D. its seating capacity

29. What is the author’s main concern?

A. How to make 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.

30. What provides autos with electric power in an automated highway system?

A. An engine. B. A rail

C. A retractable arm. D. A computer controller.

31. In an automated highway system, all the drivers needs to do is ______.