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

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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 a 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

We can 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