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单项选择题

The Grand Canyon carved by（）is one of natures most important sights.

A.the Columbia River
B.the Colorado River
C.the Rio Grande River
D.the Missouri River

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单项选择题

The contradiction that arose at the Constitutional Conference of 1787was contradiction between（）

A.big states and small states
B.industrial-commercial interests and landed interests
C.one house or two houses for Congress
D.both A and B
单项选择题

Physicists from all over the world came to the U.S.to （）the hundredth anniversary of Einstein’s birth.

A.congratulate
B.celebrate
C.decorate
D.participate
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