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1、John Snow was a well-known doctorin Lo ndon in the 19th century. He wanted to f ind the cause of cholera in order to defeat it. In 1854 when a cholera broke out, he began to g ather information. He marked_ on a ma p where all the dead people had lived an d he found that many people who had d runk the dirty water from the pump die d. So he decided that the polluted water carried cholera. He suggested that the s ource of all water supply be examined. Finally, “King Cholera” was defeated。

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