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

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单项选择题

Despite their varied designs, navigation computers used in cars ______.

A．are more or ness 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