Can dolphins talk ? They can't talk with words, but they talk with sounds. They show their feelings with sounds.

 Dolphinp travel in a group. We call a group of fish a“school". They don't study, but they travel together Dolphins are mammals, not fish, but they swim together in a school.

 Dolphins talk to the other dolphins in the school. They give information. They tell when they are happy or sad or afraid .They say "Welcome” when a dolphin comes back to the school. They talk when they play.

 They make a few sounds above water They make many more sounds under water. People cannot hear these sounds because the sounds are very, very high. Scientists make tapes of the sounds and study them.

 Sometimes people catch dolphins for a large aquarium. People can watch the dolplains in a show Dolphins don't like to be away from their school in an aquarium. They are sad.

 There are many stories about dolphins. They help people. Sometimes they save somebody's life. Dolphin meat is good, but people don't like to kill them. They say that dolphins bring good luck. Many people believe this.

    It was a Christmas night. I was an unlucky nurse who had to work on such a beautiful festival. When I was complaining(抱怨)about it, three people appeared at my desk－a tired woman and her two children, a son and a daughter.

    "Are you all sick?" I asked doubtfully because they seemed all right.

"Yes," the woman answered weakly and lowered her head.

    But when they started to present their problems, things became unclear. The daughter had a fever, but her temperature was OK. The son had an earache, but he couldn't tell me which ear hurt. It seemed that the mother was pretending(假装)to cough.

    Something was wrong. But I only explained that it might take a while before a doctor could meet them. "Take your time, please," said the mother. I checked their charts－no address.  All of a sudden I knew they were homeless while the hospital was warm.

    The family huddled(蜷缩)together under the Christmas tree, smiling and talking with each other sweetly. Quietly, I went back to the nurses' station and told them what happened in the waiting room. It was just like God sending us a gift on this Christmas night. The nurses' station suddenly came back to life. All the nurses went into action for "a Christmas emergency(急诊)".

    We took out our meals for our Christmas "patients". We also put together oranges and apples as presents. We tried to exceed(超过)the needs of a family who only wanted a warm place on Christmas night. Later, the little girl kissed me and said, "Thanks for being our angel."