______lie(s)between the boundary of Canada and the U. S. and serve(s)as the boundary betwe

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______lie(s)between the boundary of Canada and the U. S. and serve(s)as the boundary between the two countries.

A.The Mississippi River

B.The Great Lakes

C.The Rocky Mountains

D.The Grand Canyon

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热搜:关于氨基酸代谢错误的论述是_________。