【題目】 黃土高原是我國水土流失最嚴(yán)重的地區(qū)，黃土高原的土地總面約為53方平方千米，其流失面積大約43萬平方千米，其中嚴(yán)重流失區(qū)約有25萬平方千米。這里地面支離破碎，生產(chǎn)條件差。徹底治理黃土高原，是我國緊迫而艱巨的任務(wù)。

據(jù)此完成下列各題。

【1】黃土高原水土流失嚴(yán)重的人為原因是( )

A. 氣候干旱，沙丘向南遷移B. 地面徑流量少，降水集中多暴雨，流水侵蝕嚴(yán)重

C. 植被稀少D. 過度墾荒，不合理地利用土地

【2】整治黃土高原的中心任務(wù)是( )

A. 制止濫墾、濫伐、濫牧B. 在溝口打壩淤地，不讓水土出溝

C. 開辟梯田，發(fā)展農(nóng)業(yè)生產(chǎn)D. 實行水土保持，以生物措施為主，結(jié)合工程措施治理

【3】香港建設(shè)高層建筑和填海造地的最主要原因是( )

A. 人多地少B. 信息發(fā)達

C. 建筑水平高D. 資金雄厚

【答案】

【1】D

【2】D

【3】A

【解析】

【1】題中ABC黃土高原水土流失是自然原因；人為原因是過度墾荒，不合理地利用土地；D符合題意。

【2】整治黃土高原的中心任務(wù)是治理水土流失，實行水土保持，以生物措施為主，結(jié)合工程措施治理；D符合題意。

【3】香港建設(shè)高層建筑和填海造地的最主要原因是人多地少，土地資源嚴(yán)重不足；A符合題意。

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