| 长江洪涝发生原因？ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ |
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②有三大洪水来源（宜昌以上的长江上游干支流；中游南面的洞庭湖、鄱阳湖两大水系；北面汉江）；③社会原因：围湖造田、滥伐森林、陡坡开荒等。
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