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
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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 has been stated in the passage that the growth of specialist societies and periodicals has helped scholars to ______.
A．spend less time traveling
B．cut down research costs
C．develop their ideas more quickly
D．keep up with current developments
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