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

<上一题目录下一题>

热门试题

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

According to the passage, it has long been believed that ______.

A．people in poor countries scarcely know how to enjoy a high standard of living
B．the world's resources being limited, the people in underdeveloped countries are bound to live a poor life
C．most Americans know that the world's resources of many kinds are becoming scarce
D．it is impossible for all the people in the world to improve their living standards