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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。据此完成下列各题。

【1】甲图中AB段河流

A.由西北流向东南

B.有东南流向西北

C.水位A处低于B处

D.不能确定

【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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