题目内容

【题目】黄河下游流域面积狭小的主要原因是（ ）

A．峡谷多，水流急 B．瀑布多，河道深

C．洼地多，降水少 D．形成“地上河”，支流少

【答案】D

【解析】

试题分析：黄河是我国第二长河，也是世界著名大河之一．它源自巴颜喀拉山，流经青海、四川等9省区，注入渤海，全长5464千米，流域面积75.24万平方千米．

解：黄河中游流经黄土高原，由于水土流失严重，河流泥沙大增，下游在华北平原上，河床宽坦，水流缓慢，泥沙大量淤积，使河床抬高，成为举世闻名的地上河．基本无支流汇入，流域面积狭小．

故选：D．

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