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 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, 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

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