单项选择题

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
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
单项选择题
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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