【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”。讀圖，完成下列各題。

【1】甲圖中AB段河流 （ ）

A．由西北流向東南 B．由東南流向西北

C．水位A處低于B處 D．B處河水流速快于A處

【2】乙圖中河流出現(xiàn)最高水位時，可能是由于出現(xiàn)下列現(xiàn)象中的何種現(xiàn)象造成的（ ）

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(jù)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(diào)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(diào)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(jù)乙圖中A水位線的特點，河流出現(xiàn)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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