单项选择题

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

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单项选择题

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

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