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【題目】下圖中甲是我國東部河流某河段示意圖,乙是河流A、B兩水文站測得的水位變化圖。據此完成下列各題。

【1】甲圖中AB段河流

A.由西北流向東南

B.有東南流向西北

C.水位A處低于B處

D.不能確定

【2】乙圖中河流出現最高水位時,可能是由于出現下列現象中的造成的

A.氣旋活動頻繁 B.梅雨連綿

C.冰雪融化 D.春雨霏霏

【答案】

【1】A

【2】B

【解析】

試題分析:

【1】根據圖乙分析,A水位站水位季節(jié)變化大,說明位于漂泊上游,沒有湖泊調節(jié)作用影響。B水文站水位變化小,說明位于湖泊下游,受到湖泊調節(jié)徑流的作用影響。所以甲圖中AB段河流自A流向B,即由西北流向東南,A對,B、C、D錯。

【2】根據乙圖中A水位線的特點,河流出現最高水位時是6月,7、8月份水位較低,該地可能是長江中下游地區(qū),6月份是梅雨天氣,降水多,徑流量大。7、8月份是伏旱天氣所以降水少,徑流量下降。是由梅雨連綿的天氣造成的,B對。A、C、D錯。

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