【題目】 黃河是中華文明的搖籃，但又被稱為“中國的憂患”，結(jié)合所學(xué)知識完成下面小題。

【1】黃河河水含沙量大的主要原因是（ ）

A.沿岸工業(yè)發(fā)達，污染嚴重B.黃土高原植被破壞，水土流失嚴重

C.過度抽取河水，帶走泥沙D.水中行船多，攪動河沙

【2】黃河下游出現(xiàn)“人在水下走，船在天上行”，這現(xiàn)象說明（ ）

A.黃河形成地上河B.我國發(fā)射宇宙飛船

C.人們的美好愿望D.海市蜃樓，船影在天上

【答案】

【1】B

【2】A

【解析】

【1】

黃河中游穿行于土質(zhì)疏松、植被稀少的黃土高原。在夏季暴雨的沖刷下，黃土高原水土流失嚴重，有無定河、汾河、渭河等支流匯入，隨著流量的不斷增加，河水的含沙量也急劇上升。進入黃河的泥沙近90%來自于中游流域。結(jié)合題意。故選B。

【2】

黃河中游流經(jīng)黃土高原，由于水土流失嚴重，河流泥沙大增，下游在華北平原上，河床寬坦，水流緩慢，泥沙大量淤積，使河床抬高，成為舉世聞名的地上河�！啊叭嗽谒伦�，船在天上行”是對“地上河”現(xiàn)象的生動描述。故選A。

本題考查黃河各河段特征。

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