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    【题目】北疆阿尔泰山和准葛尔盆地以西山地的河流，常在4—6月发生洪水灾害，其特征为“一日一峰”，白天流量很大，夜晚消退。结合材料，回答下列各题。

    【1】此类洪水的直接补给水源为（ ）

    A．季节性积雪融水 B．大气降水

    C．冰川融水 D．湖泊决堤

    【2】“一日一峰”反映的当地环境特征是（ ）

    A．降水变率大 B．自然灾害多

    C．冰雪融化快 D．气候大陆性强

    【答案】

    【1】A

    【2】D

    【解析】

    试题分析：

    【1】根据材料，该地位于干旱区，大气降水少，B错。此类洪水的特征为一日一峰，白天流量很大，夜晚消退。说明河流水量受气温影响，4-6月是春季，主要补给水源为季节性积雪融水，A对。高山冰川融水是夏季主要补给水源，C错。湖泊水补给径流稳定，D错。

    【2】一日一峰反映当地的环境特征是气候大陆性强，昼夜温差大，D对。与降水变率关系不大，A错。一日一峰不能反映冰雪融化快、自然灾害多的特征，B、C错。

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