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

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

By common resources (Par

A．2), the writer means that ______.A. the resources possessed by the United States should be shared by other countriesB. Americans have the right to consume resources both from their home country and from abroadC. it is difficult to distinguish the resources possessed by America from those possessed by other countriesD. all the resources in the world should be shared by all the countries