题目内容
The Great Lakes are the economic lifeline of the Midwest because they provide transportation for materials such as iron ore, coal, and grain.
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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.
The Mississippi river, which rises in the lake region in North and flows south to the Gulf of Mexico, is 3,782 kilometers long.
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