题目内容

【题目】L湖原是新疆最大的淡水湖，近年来已演变成微咸水湖。现在该湖西部沿岸芦苇广布， 而东部沿岸几乎没有。下图示意L湖及周边地区，读图回答下列各题。

【1】正确描述甲、乙两河与L湖相互关系的是( )

A．甲河秋季输人L湖泥沙最多

B．甲河流量变化深受L湖影响

C．乙河是L湖重要补给水源

D．乙河对L湖具有排盐作用

【2】对L湖东、西两岸芦苇分布差异影响最小的因素是 ( )

A．主导风向 B．湖水盐度

C．沿岸坡度 D．土壤肥力

【答案】

【1】D

【2】A

【解析】

试题分析：

【1】河流流向与等高线凸出方向相反，读图，根据图中等高线判断河流流向，甲河补给L湖，L湖补给乙河，C错。图示区位于新疆，以冰雪融水补给为主，夏季气温高，甲河流水量大，输入L湖泥沙最多，A错，甲河在湖泊上游，流量不受L湖影响，B错。乙河流出湖泊，对L湖具有排盐作用，D对。

【2】芦苇是淡水、浅水域生长的植物，所以其生长受水面深浅、盐度高低和土壤肥力影响较大，B、C、D影响较大。主导风向与水的盐度、深浅无关，芦苇分布与主导风向无关，A影响最小，选A。

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