【題目】L湖原是新疆最大的淡水湖,近年來已演變成微咸水湖。現(xiàn)在該湖西部沿岸蘆葦廣布, 而東部沿岸幾乎沒有。下圖示意L湖及周邊地區(qū),讀圖回答下列各題。

【1】正確描述甲、乙兩河與L湖相互關(guān)系的是( )

A.甲河秋季輸人L湖泥沙最多

B.甲河流量變化深受L湖影響

C.乙河是L湖重要補(bǔ)給水源

D.乙河對L湖具有排鹽作用

【2】對L湖東、西兩岸蘆葦分布差異影響最小的因素是 ( )

A.主導(dǎo)風(fēng)向 B.湖水鹽度

C.沿岸坡度 D.土壤肥力

【答案】

【1】D

【2】A

【解析】

試題分析:

【1】河流流向與等高線凸出方向相反,讀圖,根據(jù)圖中等高線判斷河流流向,甲河補(bǔ)給L湖,L湖補(bǔ)給乙河,C錯(cuò)。圖示區(qū)位于新疆,以冰雪融水補(bǔ)給為主,夏季氣溫高,甲河流水量大,輸入L湖泥沙最多,A錯(cuò),甲河在湖泊上游,流量不受L湖影響,B錯(cuò)。乙河流出湖泊,對L湖具有排鹽作用,D對。

【2】蘆葦是淡水、淺水域生長的植物,所以其生長受水面深淺、鹽度高低和土壤肥力影響較大,B、C、D影響較大。主導(dǎo)風(fēng)向與水的鹽度、深淺無關(guān),蘆葦分布與主導(dǎo)風(fēng)向無關(guān),A影響最小,選A。

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