[题目]下图中甲是“我国东部河流某河段示意图 .乙是“河流A.B两水文站测得的水位变化图 .读图.完成下列各题.[1]甲图中AB段河流 ( ) A．由西北流向东南 B．由东南流向西北C．水位A处低于B处 D．B处河水流速快于A处[2]乙图中河流出现最高水位时.可能是由于出现下列现象中的何种现象造成的( )A．气旋活动频繁 B．梅题目和参考答案——青夏教育精英家教网—

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【题目】下图中甲是“我国东部河流某河段示意图”，乙是“河流A、B两水文站测得的水位变化图”。读图，完成下列各题。

【1】甲图中AB段河流（）

A．由西北流向东南 B．由东南流向西北

C．水位A处低于B处 D．B处河水流速快于A处

【2】乙图中河流出现最高水位时，可能是由于出现下列现象中的何种现象造成的（）

A．气旋活动频繁 B．梅雨连绵

C．冰雪融化 D．春雨霏霏

【答案】

【1】A

【2】B

【解析】

试题分析：

【1】根据图乙分析，A水位站水位季节变化大，说明位于漂泊上游，没有湖泊调节作用影响。B水文站水位变化小，说明位于湖泊下游，受到湖泊调节径流的作用影响。所以甲图中AB段河流自A流向B，即由西北流向东南，A对，B、C、D错。

【2】根据乙图中A水位线的特点，河流出现最高水位时是6月，7、8月份水位较低，该地可能是长江中下游地区，6月份是梅雨天气，降水多，径流量大。7、8月份是伏旱天气所以降水少，径流量下降。是由梅雨连绵的天气造成的，B对。A、C、D错。

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