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.

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.