高中英语必修五第一单元课文缩写
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John Snow was a well-known doctor in London in the 19th century. He wanted to find the cause of cholera in order to defeat it. In 1854 when a cholera broke out, he began to gather information. He marked on a map where all the dead people had lived and he found that many people who had drunk the dirty water from the pump died. So he decided that the polluted water carried cholera. He suggested that the souce of all water supply be examined and new methods of dealing with polluted water be found. Finally, “King Cholera” was defeated.

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