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

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

选项 A、The Mississippi River
B、The Great Lakes
C、The Rocky Mountains
D、The Grand Canyon

答案B

解析 五大湖位于加拿大和美国之间,成为两国间的天然疆界。
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