单项选择题

The longest and the most important river in the USA is

A. the Columbia River.

B. the Mississippi River.
C. the Ohio River.

D. the Colorado River.
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All the Representatives in the US are elected every ______ years.
A. two
B. three
C. four
D. five
单项选择题
Australia was originally one colony of
A. America.

B. Britain.
C. Canada.
D. France.
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