图为我国旱涝灾害分布示意图，读图分析回答下列各题。
（1）我国旱涝灾害分布规律及其原因是________________________________________________________
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（2）图中A地洪涝灾害多发的月份是____________，从大气环流角度分析原因是_____________________
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旱灾多发的月份是，形成的原因是___________________________________________________________
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（3）B地旱涝灾害频繁对当地农业生态环境有什么影响？可采取哪些对策？
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