正文
言之有理化学课开始了，老师经过一通理论说教后，进入了实验阶段。“同学们注意了，”老师郑重其事地说：“我手上有一块银元，现在我要把它投进这杯硫酸里面，回想一下我刚才讲过的内容，银元会溶解吗？”立刻有一个声音答道：“不会。”“为什么？”老师追问道。“如果银元会溶解的话，您一定舍不得投进硫酸里面。”《笑林广记》
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