读我国某区域图,回答下列问题。(共12分)

(1)根据图中信息,描述该地区地势的总体特征并说明判断依据。(3分)
                                                                                         
                                                                                        
(2)图中黄河段流域面积狭小,其主要原因              。简要分析图中黄河段流量往下游不断减少的原因。(4分)
                                                                                         
                                                                                        
                                                                                         
(3)郑州及其附近地区自古以来就是我国重要的农业区,简述其农业发展的有利条件。(5分)
                                                                                        
                                                                                       
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