单项选择题

The writer says that travel was important in the past because it ______.

A．was a way of spreading ideas
B．broke down political barriers
C．led to economic progress
D．made new ideas less schooling
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单项选择题
The writer thinks that the growth of specialist societies and periodicals has helped scholars to ______.
A．spend less time travelling
B．cut down research costs
C．develop their ideas more quickly
D．keep up with current developments
单项选择题
Developments in international cooperation are often, it is suggested, 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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