2001年1月大学英语六级考试真题试卷 - 阅读3
Questions 21 to 25 are based on the following passage.
What might driving on an automated highway be like? The answer depends on what kind of system is ultimately adopted. Two distinct types are on the drawing board. The first is a specialpurpose lane system, in which certain lanes are reserved for automated vehicles. The second is a mixed traffic system: fully automated vehicles would share the road with partially automated or manual driven cars. A specialpurpose lane system would require more extensive physical modifications to existing highways, but it promises the greatest gains in freeway（高速公路）capacity.
Under either scheme, the driver would specify the desired destination, furnishing this information to a computer in the car at the beginning of the trip or perhaps just before reaching the automated highway. If a mixed traffic system way was in place, automated driving could begin whenever the driver was on suitably equipped roads. If specialpurpose lanes were available, the car could enter them and join existing traffic in two different ways. One method would use a special onramp(入口引道).
As the driver approached the point of entry for the highway, devices install ed on the roadside would electronically check the vehicle to determine its destinati on and to ascertain that it had the proper
in good working order. Assuming it passed such tests, the driver would then be guided through a gate and toward an automated lane. In this case, the transition from manual to auto mated control would take place on the entrance ramp. An alternative technique could employ conventional lanes, which would be shared by automated and regular vehicles. The driver would steer onto the highway and move in normal fashion to a "transition'lane. The vehicle would then shift under computer control onto alane reserved for automated traffic. (The limitation of these lanes to automated traffic would, presumably, be well respected, because all trespassers(非法进入者) could be swiftly identified by authorities.) Either approach to joining a lane of automated traffic would harmonize the movement of newly 
with those already traveling. Automatic control here should allow for smooth merging without the usual uncertainties and potential for accidents. And once a vehicle had settled into autmated travel, the driverwould be free to release the wheel, open the morning paper or just relax. 21. We learn from the first paragraph that two systems of automated highways ________.
A) are being planned
B) are being modified
C) are now in wide use
D) are under construction
22. A specialpurpose lane system is probably advantageous in that ________.
A) it would require only minor changes to existing highways
B) it would achieve the greatest highway traffic efficiency
C) it has a lane for both automated and partially automated vehicles
D) it offers more lanes for automated vehicles
23. Which of the following is true about driving on an automated highway?
A) Vehicles traveling on it are assigned different lanes according to their destinations.
B) A car can join existing traffic any time in a mixed lane system.
C)The driver should inform his car computer of his destination before driving onto it.
D) The driver should share the automated lane with those of regular vehicles.
24. We know from the passage that a car can enter a specialpurpose lane________.
A) by smoothly merging with cars on the conventional lane
B) by way of a ramp with electronic control devices
C) through a specially guarded gate
D) after all trespassers are identified and removed
25. When driving in an automated lane, the driver ________.
A) should harmonize with newly entering cars
B) doesn't have to rely on his computer system
C) should watch out for potential accidents
D) doesn't have to hold on to the steering wheel
21. 正确答案为A)。根据第1段第2，3句：The answer depends on what kind of system is ultimately adopted. Two distinct types are on the drawing board. (答案取决于最后采用哪一种系统，两种不同的类型都在绘图板上。)回答此问题的关键是要知道drawingboard的意思。所以选项A) are being planned是正确答案。
22. 正确答案为B)。根据第1段最后一句：A specialpurpose lane system would require more extensive physical modifications to existing highways,but it promises the greatest gains in freeway capacity (特别目的车道系统要求对现有的高速公路进行更广泛的改造，但它会使高速公路获得最大的能力。)
23. 正确答案为C)。根据第2段第1句：Under either scheme, the driver would specify the desired destination, furnishing this information to a computer in the car at the beginning of the trip or perhaps just before reaching the automated highway.(不论采用那种设计，司机都需要在其开始行驶时或在到达自动化高速公路前确定要去的目的地，把这个信息输入车上的计算机。)故C)是正确答案。选项B)与文章内容相悖，因为原文第2段第2句是on suitably equipped roads而不是existing traffic。选项D)提到的情况只适用于第2种设计方案，即混合式交通系统。故A)，B)，D)均不是答案。
24. 正确答案为B)。根据文章第2段第3，4，5句：如果使用特殊目的的车道……一种方法是使 用特殊的人口引道。当司机接近高速公路人口处时，安装在道边的电子装置会检测车辆的目的地并搞清是否有能工作的自动化装置。(If specialpurpose lanes were available,…One method would use a special onramp. As drivers approached the point of entry for the highway, devices installed on the roadside would electronically check the vehicle to determine its destination and to ascertain that it had the proper
in good working order.) 25. 正确答案为D)。根据第3段的最后一句：And once a vehicle had settled into automated travel, the driver would be free to release the wheel, open the morning paperor just relax. (一旦车辆进入自动行驶状态，司机就可以放开方向盘，打开晨报或者只是休息。)
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