摘要： The government must take effective measures to prevent all the factories from rivers. B): 根据短文内容.在空格中填上合适的单词.单词的首字母已给出. John Snow was a well-known doctor in London in the 19th century. At that time, so–called “King Cholera h 71 Londoners frequently, which often resulted in large numbers of d 72 . John Snow wanted to find the c 73 of cholera in order to defeat it. In 1854 when a cholera broke out, he began to g 74 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 was to blame. He suggested that the resource of all water supply be examined and new methods of dealing with polluted water be found. Finally,“King Cholera was d 75 .

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