【題目】讀下圖流經(jīng)黃土高原的黃河景觀圖回答下列問(wèn)題。

【1】圖中大量泥沙匯入黃河,其主要自然原因

黃土疏松 河流落差小

植被覆蓋好 夏季多暴雨

A①② B.①④

C.②③ D.③④

【2】黃土高原面臨的主要環(huán)境問(wèn)題是

A.氣候變暖 B.旱澇災(zāi)害

C.水土流失 D.土地荒漠化

【3】黃土高原綜合治理和保護(hù)環(huán)境的正確措施是

植樹(shù)種草 打壩淤地 開(kāi)墾荒地 發(fā)展水田

A①② B①③ C②④ D③④

【答案】

【1】B

【2】C

【3】A

【解析】

試題分析:

【1】讀圖可知,圖中大量泥沙匯入黃河,是由于黃土高原水土流失造成的。導(dǎo)致水土流失嚴(yán)重的主要自然原因是黃土高原土質(zhì)疏松,植被稀少,夏季暴雨多等。故選B。

【2】黃土高原地處我國(guó)東部季風(fēng)區(qū)向西北內(nèi)陸干旱區(qū)過(guò)渡帶、森林向草原的過(guò)渡帶等多重過(guò)渡地區(qū),生態(tài)環(huán)境脆弱,黃土疏松,地表植被覆蓋率低,降水變率大且集中,加之人類(lèi)不合理經(jīng)濟(jì)活動(dòng),導(dǎo)致嚴(yán)重水土流失,故選C。

【3】黃土高原綜合治理主要在于防治水土流失?梢圆扇≈矘(shù)種草方式,提高植被覆蓋率,打壩淤地等工程措施,①②對(duì)。而開(kāi)墾荒地,會(huì)加劇水土流失,發(fā)展水田不符合區(qū)域經(jīng)濟(jì)發(fā)展的因地制宜原則,③④錯(cuò)。故選A。

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