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
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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