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 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
单项选择题
According to the passage, scholars and students are great travelers because ______.
A．standards are higher at foreign universities
B．their governments encourage them to travel
C．salaries and conditions are better abroad
D．they are eager for new knowledge
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