题目内容
The carved by the Colorado River is 1.5 kilometers deep, 320 kilometers long and as much as 29 kilometers wide in some places.
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is the largest city in the US Pacific Coast and is also the second largest city of America.
The U.S. lies in North America, with Canada to the north, Mexico to the south, the Atlantic to its and the Pacific to its .
The continental United States has states.
The longest river in the U.S. is .
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