There once lived a scholar（学者）called Dong Guo，who was a very kind-hearted man.
One day，as he was walking alone in the hills with his donkey and a bag of books，a wolf suddenly came running up to him
"Kind-hearted master，save me，"it said in a frightened voice.
"The hunters are after me and they want to kill me.Please hide me in your bag.If you will save me，I will remember your kindness for ever，"
Seeing how frightened it was，Dong Guo took pity on the beast.He quickly took out the books and pushed the wolf into the bag.Then he continued on his way with his donkey and the bag.
Soon a group of hunters came.Seeing no wolf，they went away in a huny.
After a while，the wolf said，"Let me out，master."So the scholar let it out，it showed its ugly long teeth and said，"I am terribly hungry，and will die if I do not have something to eat at once.You have saved me once，kindhearted man，If you really want to save me，let me eat you now，"With these words，it jumped on to the scholar.
Dong Guo was shocked（震惊的）.He hid himself behind the donkey，doing the best he could to defend himself.Meanwhile he scolded
（训斥）the wolf for"heartless and ungrateful（忘恩负义的）.
Just then a farmer came by.The scholar called out to the farmer to save him.Holding the farmer by the hand，Dong Guo told the whole story.
"Now，should the wolf eat me after all I have done for him？"He asked angrily.But the wolf said："He put me in his bag and I could hardly breathe in there.He really wanted to kill me.Why should I not eat him up？"So the arguement（争吵）went on.
"But look here，"said the farmer，"I could hardly believe this bag is big enough to hold a wolf.I must see it with my own eyes."
To prove this，the wolf got into bag.He quickly tied up the bag as before.With a mighty（用力地）swing（甩）of his hoe the farmer killed the wolf.
Dong Guo thanked the farmer again and again.But farmer said.
"Now you should know what to do with the enemy of man."