阅读下面短文，然后根据短文内容回答问题。

    One day, a poor boy who was selling things from door to door found that he only has a cent(美分) left. He was so hungry that he decided to ask for a meal at the nex t house.

     However, he just asked for a glass of water when a beautiful young woman opened the door. She though he looked hungry, so she brought him a lager glass milk. He drank in slowly, and then asked, “How much do I owe (欠) you”

     “You don’t owe me anything.” she replied, “Mother has taught me never to accept pay for a kindness.”

     Years later the women needed an operation(手术). The local doctors could do nothing. The finally sent her to a big city. Dr. Milton, who was famous, was called in for the consultation (会诊). When he heard the name of the town she cam form, he went to see her. He recognized  (认出) her at one. At the same time, he made his decision to try his best to save her life.

     After hard work, the operation was successful. Dr. Milton asked the nurse to pass the final bill to him. He wrote something on the side. The bill was sent to the patient’s room. She was afraid to open it because she thought it would cost all her money. To her surprise, she saw there words written by Dr. Milton: “Paid in full with a glass of milk.”

     Tears ran out of her eyes as she said silently, “Thank you. Love has spread through human hears and hands.”