【題目】今日水資源嚴(yán)重短缺的西安市隋唐時期用水充足,有“陸!保ㄖ负春驼訚珊芏啵┑拿婪Q。該圖示意古長安(今西安市長安區(qū))“八水”位置。讀圖完成下面小題。

1“八水繞長安”的地質(zhì)成因之一是渭河平原地殼(  )

A. 水平錯斷 B. 褶皺凹陷

C. 斷裂陷落 D. 水平張裂

2古長安“陸!苯袢詹粡(fù)存在的重要原因是(  )

A. 秦嶺北坡森林植被破壞 B. 渭河流域水體污染嚴(yán)重

C. 渭河下游汛期水位上升 D. 秦嶺南坡耕地面積增加

【答案】

1C

2A

【解析】試題分析:

1】西安位于渭河平原,處于地殼斷裂下陷形成的地塹上,地勢較低。C正確。

2】大量湖泊、沼澤消失的原因既有農(nóng)業(yè)墾荒減少了濕地面積,也包括用水增加、植被破壞導(dǎo)致濕地補(bǔ)給受到嚴(yán)重影響。在上述因素的共同作用下,當(dāng)?shù)卮罅亢、沼澤消失。因秦嶺北坡植被對渭河南岸支流有重要的涵養(yǎng)水源的作用,故北坡植被破壞對下游河流、湖泊、洼地影響巨大。A正確。

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