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.

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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.

单项选择题

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.