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

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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

It is important for specialists to be able to travel because ______.

A．there are so many people working in similar fields
B．there is a lot of social unrest at universities
C．their follow experts are scattered round the world
D．their laboratories are in remote places