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

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

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