单项选择题

How many Americans are there in colleges and universities

A．About seven million.
B．Nearly half of the American population.
C．Young persons under twenty-five.
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单项选择题
Mr. Black said the local bird was an interpreter because ______.
A．the three Chinese birds didn't know English
B．it was different from the Chinese birds
C．he was making a joke
单项选择题
Mr. Black returned to London ______.
A．by train
B．by ship
C．by plane
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