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

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

单项选择题

The writer warns Americans that ______.

A．their excessive consumption has caused world resource exhaustion
B．they are confronted with the problem of how to obtain more material goods
C．their unfair share of the world's resources should give way to proper division among countries
D．they have to discard their cars for lack of fossil fuel in the world