【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】

1D

2D

3A

【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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