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

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 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.