题目内容

【题目】每年4～6月，我国新疆阿勒泰地区的河流常常发生洪水灾害，其特征为“一日一汛”，即白天河流流量很大，夜晚则洪峰消退。据此完成下列各题。

【1】此类洪水的直接补给水源主要是( )

A．大气降水 B．高山冰川融水 C．季节性积雪融水 D．湖泊水

【2】“一日一汛”反映了当地( )

A．冰雪融化迅速 B．昼夜温差大 C．降水变率很大 D．自然灾害频繁

【答案】

【1】C

【2】B

【解析】

试题分析：

【1】新疆位于我国西北内陆，降水少，河流补给水源以冰雪融水补给为主，4-6月，气温较低，海拔较低的季节性积雪融化，是河流的主要补给水源，夏季气温升高，季节性积雪融化完，高山冰川融水补给为主，冰雪融化受气温影响。

【2】“一日一汛”说明白天积雪融化多，河流水量大，夜晚融化少，河流水量小，说明昼夜温差大，“一日一汛”反映的是水量变化，不是灾害多少。

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