题目内容
The rivers that descend from the eastern slopes of the Rockies flow into the and the Gulf of Mexico. Those that begin on the western slopes of the Rockies flow to the Pacific Ocean and the Gulf of California.
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The Great Lakes are the economic lifeline of the Midwest because they provide transportation for materials such as iron ore, coal, and grain.
The US Great Lakes are Lake Superior, Lake Michigan, Lake , Lake Erie and Lake Ontario.
Lake is the largest fresh water lake in the world while Lake Michigan is the only one almost entirely located in the US.
All the farms and cities in the US southwestern corner depend on the water of River. Today a system of dams has been built on the river to supply water and electricity for farms, factories and homes.
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