[题目]今日水资源严重短缺的西安市隋唐时期用水充足.有“陆海的美称.该图示意古长安“八水位置.读图完成下面小题.[1]“八水绕长安的地质成因之一是渭河平原地壳( )A. 水平错断 B. 褶皱凹陷C. 断裂陷落 D. 水平张裂[2]古长安“陆海今日不复存在的重要原因是( )A. 秦岭北坡森林植被破坏 B. 渭河流域水体污染严重C. 渭河下� 题目和参考答案——青夏教育精英家教网—

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【题目】今日水资源严重短缺的西安市隋唐时期用水充足，有“陆海”（指湖泊和沼泽很多）的美称。该图示意古长安（今西安市长安区）“八水”位置。读图完成下面小题。

【1】“八水绕长安”的地质成因之一是渭河平原地壳(　　)

A. 水平错断 B. 褶皱凹陷

C. 断裂陷落 D. 水平张裂

【2】古长安“陆海”今日不复存在的重要原因是(　　)

A. 秦岭北坡森林植被破坏 B. 渭河流域水体污染严重

C. 渭河下游汛期水位上升 D. 秦岭南坡耕地面积增加

【答案】

【1】C

【2】A

【解析】试题分析：

【1】西安位于渭河平原，处于地壳断裂下陷形成的地堑上，地势较低。C正确。

【2】大量湖泊、沼泽消失的原因既有农业垦荒减少了湿地面积，也包括用水增加、植被破坏导致湿地补给受到严重影响。在上述因素的共同作用下，当地大量湖泊、沼泽消失。因秦岭北坡植被对渭河南岸支流有重要的涵养水源的作用，故北坡植被破坏对下游河流、湖泊、洼地影响巨大。A正确。

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