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 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
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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