one day mr．green sees a young woman and some children in the street．he is very surprised，because all the children are wearing the same clothes．they are wearing black caps，white coats and yellow trousers．
    “are all these children yours?” he asks the woman．
    “yes，they are，” she answers．
    “do you always dress them in the same clothes?” asks mr．green．
    “yes，” answers the mother．“when we had only four children，we dressed them in the same clothes because we didn’t want to lose any of them．it was easy to see our children among other children，because they were all wearing the same clothes．and now，when we have ten，we dress them like this because we don’t want to take other children home by mistake．when there are other children among ours，it’s easy to see them because their clothes are different．”

词汇解析
surprised adj. 令人吃惊的 among prep. 在.....中间 by mistake 弄错