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【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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