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阅读材料,结合所学知识回答下列问题。(60分) 材料一 上海基本上可以算得上是我国腹地面积最大的城市。上海地处长三角洲,可通过便利的长水道航运,深入内陆千余公里。下图是长流域局部水系图。 材料二 鄱阳湖和洞庭湖是长流域两大湖泊,洞庭湖是长主要的集水、蓄洪区。鄱阳湖的位置略高于长,对长干流的调节作用不及洞庭湖.两大湖泊对长干流洪水均有削峰补枯的调节作用。 (1)据图及材料,分别说明鄱阳湖和洞庭湖在汛期对长干流洪水调节作用。(10分) (2)据考查,长干流自攀枝花以下至出海口,可观察到各类排污口,城市沿河段出现沿岸污染带,试分析造成该现象的原因。(10分)
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