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    【题目】20世纪30年代，美国中西部大草原过度开垦、放牧，造成频繁的“黑风暴”刮起了3亿吨尘土。据此完成下列问题。

    【1】“黑风暴”现象的直接原因主要是

    A. 植被遭到破坏 B. 地下水位下降

    C. 降水异常减少 D. 温室效应加剧

    【2】“黑风暴”现象反映了自然地理环境具有 (　　)

    A. 地域性 B. 整体性

    C. 地带性 D. 非地带性

    【答案】

    【1】A

    【2】B

    【解析】试题分析：

    【1】由材料“美国中西部大草原过度开垦．放牧，造成了频繁的“黑风暴”可知，“黑风暴”是由于人类不合理的生产方式，破坏了地表植被，从而使地表失去植被保护，在风力的吹拂作用下而出现的，故选项A正确。

    【2】植被遭到破坏导致“黑风暴”的出现，说明地理环境中的某一要素发生改变，会导致其他要素甚至整个地理环境受到影响，这体现了地理环境的整体性，故选项B正确。

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