题目内容

【题目】中国最大的淡水湖——鄱阳湖有多条河流从东、南、西三面注入,北部有水道通往长江,湖泊水面呈现“冬季一条线,夏季一大片”的景象变化。鄱阳湖是候鸟迁徙途中的重要栖息地。据此完成问题。

1鄱阳湖在冬季成为迁徙鸟群重要栖息地的原因是

A. 湖滩面积大,水浅 B. 湖底砂砾石广布,水质好

C. 湖区少有大雾,能见度好 D. 湖泊受人类活动影响小

2鄱阳湖冬、夏水面景象变化的原因是

A. 湖底有线状洼地,冬季河道封冻,夏季来水量大

B. 湖底平坦,入湖水量夏季大于冬季

C. 湖底有线状洼地,水位季节差异明显

D. 湖底平坦,长江顶托作用季节变化明显

【答案】

1A

2C

【解析】试题分析:

1】根据材料,湖面冬季一条线,夏季一大片的景象变化,说明湖滩面积大,水浅,利于鸟类休栖、觅食,所以在冬季成为迁徙鸟群重要栖息地,A对。湖底砂砾石广布,水质好不是成为栖息地的原因,B错。能见度好与成为栖息地关系不大,C错。湖泊受人类活动影响大,D错。

2】鄱阳湖冬、夏水面景象变化的原因是湖底有线状洼地,水位季节差异明显,枯水期是,湖水集中在线状洼地中,C对。 冬季河道不封冻,A错。湖底不平坦,有线状洼地,BD错。

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