An old farmer lived on a farm with his young grandson. Each morning Grandpa was up early to read. One day the grandson asked, "Grandpa! What good does reading do?"

    The Grandfather quietly turned from putting coal in the stove and replied, "Take this coal basket to the river and bring me back a basket of water."

    The boy did as he was told, but all the water leaked out (漏出) before he got back to the house. The grandfather laughed and said, "You"ll have to move a little faster next time," This time the boy ran faster, but again the same took place. It was an impossible task.

    The old man said, "You're just not trying hard enough," So the boy tried a third time and failed. He said, "See Grandpa, it's useless!"

    "So you think it is useless?" The old man said, "Look at the basket."

    The boy looked at the basket and for the first time realized that the basket was different. It had been transformed from a dirty old coal basket into a clean one inside and outside.

    "You might not understand or remember everything, but when you read it, you will be changed, inside and out. "

兴趣小组甲：

兴趣小组乙：挑选豆腐→豆腐长毛→加盐腌制→加卤装瓶→密封腌制

兴趣小组丙：土壤取样→梯度稀释→接种于培养基→计数