单项选择题

Volumes have been written on the purpose of education in the United States and the subject continues to be one of active ___________ and discussion.

A．conclusion
B．concern
C．competition
D．coordination
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单项选择题
After a visit of only nine months he wrote a ___________ book called Democracy in America, which is a classic study of the American way of life.
A．victorious
B．remarkable
C．tremendous
D．voluntary
单项选择题
During the past two years, the ___________ of automobile accidents in London City has decreased.
A．proportion
B．quantity
C．amount
D．number
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