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

The navigation systems in cars like Lexus, BMW and Audi are mentioned to show ______.

A．the immaturity of the new technology
B．the superiority of the global positioning system
C．the cause of price fluctuations in car equipment
D．the different ways of providing guidance to the driver

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