The satellite signals, along with inputs on speed from a wheel-speed sensor and direction from a meter, determine the car’s position even as it moves. This information is combined with a map database. Streets, landmarks and points of interest are included.
Most systems are basically identical. The differences come in hardware—the way the computer accepts the driver’s request for directions and the way it presents the driving instructions. On most systems, a driver enters a desired address, motorway junction or point of interest via a touch screen or disc. But the Lexus screen goes a step further: you can point to any spot on the map screen and get directions to it.
BMW’s system offers a set of cross hairs(瞄准器上的十字纹) that can be moved across the map (you have several choices of map scale) to pick a point you’d like to get to. Audi’s screen can be switched to TV reception.
Even the voices that recite the directions can differ, with better systems like BMW’s and Lexus’s having a wider vocabulary. The instructions are available in French, German, Spanish, Dutch and Italian, as well as English. The driver can also choose parameters for determining the route: fastest, shortest or no freeways (高速公路), for example.
21. We learn from the passage that navigation computers .
[A] will greatly promote sales of automobiles [B] may help solve potential traffic problems
[C] are likely to be accepted by more drivers [D] will soon be viewed as a symbol of luxury
22. With a navigation computer, a driver will easily find the best route to his destination .
[A] by inputting the exact address [B] by indicating the location of his car
[C] by checking his computer database [D] by giving vocal orders to the computer
23. Despite their varied designs, navigation computers used in cars .
[A] are more or less the same price [B] provide directions in much the same way
[C] work on more or less the same principles [D] receive instructions from the same satellites
24. The navigation computer functions .
[A] by means of a direction finder and a speed detector [B] basically on satellite signals and a map database
[C] mainly through the reception of turn-by-turn directions [D] by using a screen to display satellite signals
25. The navigation systems in cars like Lexus, BMW and Audi are mentioned to show .
[A] the immaturity of the new technology [B] the superiority of the global positioning system
[C] the cause of price fluctuations in car equipment [D] the different ways of providing guidance to the driver
Passage Two
Questions 26 to 30 are based on the following passage.
The world’s environment is surprisingly healthy. Discuss. If that were an examination topic, most students would tear it apart, offering a long list of complaints from local smog(烟雾) to global climate change, from the felling(砍伐) of forests to the extinction of species. The list would largely be accurate, the concern legitimate. Yet the students who should be given the highest marks would actually be those who agreed with the statement. The surprise is how good things are, not how bad. |
