题干

如果将细胞比做汽车,那么细胞中的____相当于发动机,它将细胞中的一些____当做燃料,使之与____结合,经过复杂的变化转变成________,同时将有机物中的____释放出来供细胞利用.

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线粒体,有机物,氧气,二氧化碳,水,化学能

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    It was a Christmas night.I was an unlucky nurse who had to work on such a beautiful festival.When I was complaining 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 because 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 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(卷缩)together under the Christmas tree,smiling and talking with each other sweetly.Quietly,I went back 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".

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