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    【题目】黄土高原地区开发历史悠久，在全国经济发展中具有重要地位，但近些年来人地矛盾十分尖锐。据此回答下列问题。

    【1】黄土高原最大的环境问题是

    A. 荒漠化 B. 水土流失 C. 酸雨 D. 气候变暖

    【2】造成这种环境问题的主要人为原因是

    A. 水资源的不合理利用 B. 土壤疏松，降水变率大

    C. 过度放牧和过度樵采 D. 干旱和大风现象

    【答案】

    【1】B

    【2】C

    【解析】试题分析：

    【1】黄土高原最大的环境问题是水土流失。选B正确。

    【2】黄土高原长期以来的毁林开荒，是水土流失的主要原因；黄土土持疏松、降水变率大，是水土流失潜在的自然原因；不合理的开垦、开矿、工程建设、破坏植被是水土流失的人为原因；过度放牧和过度樵采及干旱和大风现象是荒漠化的成因。选A正确。

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