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
答案:
21.C 22.A 23.C 24.B 25.D
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