The Grand Canyon carved by______is one of natures most important sights.A.the Columbia Riv

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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

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。