短文理解  阅读下列短文，从每题所给的A、B、C三个选项中，选出最佳选项回答问题或完成句子。

      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 two children.

    "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. One child had a fever, but his temperature was OK. The other child had an earache, but she could not 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. Suddenly 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 Christmas Day. 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 toexceedthe 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（天使）."