BMWs 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 youd like to get to. Audis screen can be switched to TV reception.

　　Even the voices that recite the directions can differ, with better systems like BMWs and Lexuss 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

　　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 .

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