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（24分）阅读下列材料，回答问题。 材料一 黄河三角洲略图（）和珠江三角洲略图（右图） 材料二 黄河三角洲从十九世纪中后期开始形成，黄河三角洲湿地是世界上暖温带保存最广阔、最完善、最年轻的湿地生态系统，是东北亚与环西太平洋地区侯鸟迁徒的中转站。二十世纪末，该湿地一度萎缩并遭到破坏，水质变差。 材料三 珠江三角洲是我国重要的工业基地，近年来，该地一部分劳动力密集型和资源密集型企业向内地的边远地区转移，并在本省边缘地区产生集群效应。 材料四 长江三角洲与珠江三角洲2003年经济指标比较表 （1）到二十世纪末，黄河三角洲湿地发生了哪些变化，其原因可能有哪些？（6分） （2）与长江、珠江相比，黄河河口地区为什么没有形成大城市？（6分） （3）与长江三角洲相比，珠江三角洲单位GDP能耗较低，根据资料并应用所学知识分析其主要原因。（4分） （4）从珠扛三角洲工业区位条件的变化，分析该地区劳动密集型产业和资源密集型产业向周边地区转移的原因。（8分）
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