Mrs．Patrick  was  a piano teacher．Shehundreds of students．At age 69，Mrs．Patrick had a stroke (中风)．She couldn't move or speak．As the days passed，she got better, but her right hand was still very  ．She couldn't play the piano anymore．She was very sad．

    A few months after her stroke，Mrs．Patrick went to a senior citizens' center(老年活动中心)．There were a lot ofat the center．The director(负责人)was showing her around the center when Mrs．Patrick a piano．She looked sadly at the piano．“Is anything wrong?”the director asked．“No．”Mrs．Patrick answered．”The piano brings back my memories(回忆)．my stroke．I played the piano．”The director looked at Mrs．Patrick's weak right hand and  said．“here．I'll be right back．”A few minutes later the director came back Mrs．Eisenberg．“Margaret Patrick,” the director said，“meet Ruth Eisenberg．Before her stroke sheplayed the piano．She has a good right

hand，and you have a good left hand．I think you two can do something together．”The two women sat down at me piano and began to play．The music good．They were not sad anymore．

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①世界上最长的城墙；

②约4～5米宽，最宽处可供五匹马或十个人并行；

③2700多年前，古代皇帝为保卫国家命人修建长城，后秦始皇等命人修整。

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