One day, a foolish man carried acart of black beans to the market to sell, when hecrossed a bridge,the cart turned over and the beans fell into the river.He hurried into river to take his beans up.He saw many tadpoles in the river and mistook them for his black beans. 　
　　When the tadpoles saw a man enter the river, they took flight. The foolish man shouted,“Black beans, ah,black beans! Don’t you know me? Even though, you have grown tails, I still can know you.