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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

admin2007-12-11  72
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 first paragraph the highest allowed speed of a car is to be determined by______.
选项 A、the accelerator
B、GPS
C、a digital map
D、the driver
答案B
解析 本题为细节题，解答此题的关键在于对题干的理解和对选项的理解。 “汽车所允许的最高时速由什么决定?”选项A意为“油门”。很明显汽车油门用于提速，并可以极大地超过所允许的时速，因此这个答案不对。选项C所说的“数字地图”明显用于提醒司机在特定路段的时速限制，也不能决定所允许的最高时速。选项D是指“司机”，他可以决定汽车的速度，但是第一段中没有涉及司机与速度的关系，因此也不是正确答案。选项B中的“全球定位系统”在第一段第三句中是这样描述的： “The addition of GPS(global positioning system)navigation tells the car what the maximum speed on any given stretch of road should be”。因此B项是正确答案。
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