农谚说：蚯蚓叫，大雨到。一位农民气象员对此感到怀疑，经过反复

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农谚说："蚯蚓叫，大雨到。"一位农民气象员对此感到怀疑，经过反复观察和实验，他发现下雨前鸣叫的是蝼蛄而不是蚯蚓，于是把这条农谚改成了"蝼蛄叫，大雨到"。经过进一步观察和研究，他又发现"春秋蝼蛄叫，大雨定会到"，但"盛夏蝼蛄叫，大雨不会到"。这表明（）

①亲身的实践经验比他人的实践经验更可靠
②实践是认识的来源和发展的根本动力
③实践是认识的最终目的和归宿
④实践是检验认识正确与否的唯一标准

A．

①②

B．

①③

C．

②④

D．

③④

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