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

1黃河河水含沙量大的主要原因是( )

A.沿岸工業發達,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“人在水下走,船在天上行”,這現象說明( )

A.黃河形成地上河B.我國發射宇宙飛船

C.人們的美好愿望D.海市蜃樓,船影在天上

【答案】

1B

2A

【解析】

1

黃河中游穿行于土質疏松、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。結合題意。故選B。

2

黃河中游流經黃土高原,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。““人在水下走,船在天上行”是對“地上河”現象的生動描述。故選A。

本題考查黃河各河段特征。

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