单项选择题

The navigation computer functions ______.

A．by means of a direction finder and a speed detector.
B．basically on satellite signals and map database.
C．mainly through the reception of turn-by-turn directions.
D．by using a screen to display satellite signals.

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单项选择题

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.

单项选择题

We learn from the passage that navigation computers ______.

A．will greatly promote sales of automobile.
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.