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  3. One form of driver assistance that is sure to call one’s attention is intelligent speed adaptation (ISA) — a technology for forc

One form of driver assistance that is sure to call one’s attention is intelligent speed adaptation (ISA) — a technology for forc

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问题     One form of driver assistance that is sure to call one’s attention is intelligent speed adaptation (ISA) — a technology for forcing a driver to observe the speed limit. This works by building into the car a digital map marked with local speed restrictions. The addition of GPS (global positioning system) navigation tells the car what the maximum speed on any given stretch of road should be. Cars are then slowed down, or prevented from accelerating, whenever they are at or above the speed limit. One way to do this is to starve the engine of fuel. Another is to add a measure of play to the accelerator pedal (油门). A third is to make the accelerator harder to push down. In future drive-by-wire vehicles, the software would refuse requests from the accelerator pedal when above the speed limit.
    However, people have different opinions as far as ISA is concerned. Whatever their opinions are, the main justification for ISA is likely to be the high cost of speeding. Studies suggest that ISA could reduce the number of accidents by as much as 40%, and the number of fatal accidents by nearly 60%. It could also improve fuel efficiency, remove the need for enforcing speed limits with cameras and policemen, and reduce the costs of insurance.
    Trials of ISA systems have already been carried out in Sweden, Denmark, the Netherlands and Britain, and more are planned in Belgium and France. Although resistance is expected from drivers as well as from motor manufacturers, ISA could be introduced gradually, first with new cars and later as retro-fitting (改装) to the remaining old cars — rather as seatbelts were introduced a generation ago. The trials show that a surprisingly large proportion of people come to accept ISA after they have lived with it for a while — again, much like the experience with seatbelts.
According to the passage, ISA systems______.
选项 A、are still in their testing period
B、remain a theory to be tested
C、have found wide applications in the auto industry
D、have been a popular invention among motor makers
答案A
解析 本题为细节题，考查考生对“ISA系统现在的状况”的掌握。根据第三段第一句“Trials of ISA systems have already been carried out in Sweden，Denmark，the Netherlands and Britain，and more are planned in Belgium and France．”可见，ISA系统尚处于试验状态。因此选项A为正确答案。选项B认为该系统尚处于“理论研究有待试验阶段”显然与文章不符。选项c表示该系统在汽车行业已得到广泛应用也不符合实际。选项D认为该系统是汽车制造商中大受欢迎的发明在文中并未提及。
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