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

According to the passage, scholars and students are great travelers because ______.

A．standards are higher at foreign universities
B．their governments encourage them to travel
C．salaries and conditions are better abroad
D．they are eager for new knowledge

单项选择题

It is suggested that developments in international cooperation are often the result of ______.

A．friendships formed by scholars at meetings
B．articles in learned journals
C．the work of international agencies
D．programs initiated by governments