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
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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
单项选择题
The writer claims that it is important for specialists to be able to travel because ______.
A．there are so many people working in similar fields
B．there is a lot of social unrest at universities
C．their follow experts are scattered round the world
D．their laboratories are in remote places
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