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【简答题】
读长江水系示意图，回答下列问题． （1）长江发源于______，流经的主要地形区依次为横断山脉、______高原、______盆地、巫山、长江中下游平原，最后注入东海． （2）图中A、B、C、D是长江沿岸重要的港口，它们分别是______ A．重庆、武汉、南京、上海 B．武汉、重庆、南京、上海 C．上海、南京、武汉、重庆 D．重庆、南京、武汉、上海 （3）关于图中三个水利工程的叙述，正确的是______ A．E为二滩水电站 F为葛洲坝水利枢纽 G为丹江口水利枢纽 B．E为二滩水电站 F为三峡水利枢纽 G为丹江口水利枢纽 C．E为嘴水电站 F为葛洲坝水利枢纽 G为丹江口水利枢纽 D．E为嘴水电站 F为葛洲坝水利枢纽 G为二滩水电站．
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