题目内容

【题目】白鹤梁位于三峡景区,是全世界唯一的一处以刻石鱼为水标,并观测记录长江枯水期水位的古代水文站,被誉为世界第一水文站。当石鱼刚好完全露出水面时,第二年便为丰收年,故有石鱼出水兆丰年之说。随着三峡电站的修建,白鹤梁被完全淹没。完成下列各题。

【1】历史上欣赏石鱼,最佳时间是(

A.1月 B.4月 C.7月 D.10月

【2】三峡电站的修建,对库区及下游地区的影响是(

A.库区夏季气温升高

B.库区空气湿度增大

C.下游含沙量增大

D.下游水位季节变化增大

【答案】

【1】A

【2】B

【解析】

试题分析:

【1】根据材料,石鱼是观测记录长江枯水期水位的古代水文站。枯水期时,石鱼才能露出水面。北半球冬季是枯水期,所以,历史上欣赏石鱼,最佳时间是 1月,A对。4月、7月、10月水位较高,石鱼可能在水面下,不易欣赏到,B、C、D错。

【2】三峡电站的修建,水域面积变大,对库区及下游地区的影响是库区空气湿度增大,B对。由于水库的调节气候的作用,库区夏季气温较低,A错。泥沙在库区沉积,下游含沙量减小,C错。水库调节径流的作用,使下游水位季节变化减少,D错。

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