黄河是我国第二长河,它全长5464千米,流经9个省区。读黄河流域图,回答下列问题。
(1)写出图中字母代表的地理事物名称:
    A                      山脉 B              (城市) C              (河流) D              湖
(2)黄河在下游地区形成“地上河”的原因是什么?                                                                             
                                                                                                                                                               
(3)建国以来,我国对黄河的治理措施有哪些?                                                                                   
                                                                                                                                                              
(4)宁夏平原有“塞上江南”之称,该区农业灌溉水源主要来自                   。
读“黄河流域图”,分析回答:
(1)图中字母A所代表的支流名称是________。
(2)黄河忧患在上游的主要表现是____                                                      ____ 。
(3)黄河下游出现“地上河”的主要原因是 ____________                                         ________________
    _                                                 _ 。
(4)黄河是我国的“母亲河”,但历史上水患严重。你认为治理黄河水患在上、中、下游应采取的主要
    措施是:
    上游                                                                                                                                ;
    中游                                                                                                                                ;
    下游                                                                                                                                。
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