单选题
Some pessimistic experts feel that the automobile is
bound to fall into disuse. They see a dayin the not-too-distant future when all
autos will be abandoned and allowed to rust. Otherauthorities, however, think
the auto is here to stay. They hold that the car will remain a leadingmeans of
travel in the foreseeable future. The motorcar will undoubtedly
change significantly over the next 30 years. It should becomesmaller, safer, and
more economical, and should not be powered by the gasoline engine. The carof 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 urbantraffic congestion (拥挤). One proposed solution to this problem
is the automated highwaysystem. When the auto enters the
highway system, a retractable (可伸缩的) arm will drop from theauto 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 controlof the vehicle will pass to a central computer. The
computer will then monitor all of the car'smovements. The
driver will use a telephone to dial instructions about his destination into the
system. Thecomputer will calculate the best route, and reserve space for the car
all the way to the eorrect exitfrom the highway. The driver will then be free to
relax and wait for the buzzer (蜂鸣器) that willwarn of his coming exit. It is
estimated that an automated highway will be able to handle 10000vehicles per
hour, compared with the 1400 to 2000 vehicles that can be carried by a
present-dayhighway.
单选题
One significant improvement in the future car may probably be