20xx人教版高中英語必修五unit 1《great scientists》（period 2）-全文預(yù)覽
【正文】 p of a map B. looking into the source of the water for Broad Street and Cambridge Street C. separating those who suffered cholera from those who didn’t D. both A and B 4. To prevent the cholera from spreading again, what did John Snow do? Suggested that the source of all water supplies be examine. Suggested that new methods of dealing with polluted water be found. Instructed the water panies not to expose people to the polluted water anymore. Task 3 Mind Map of the text John Snow began to test two theories. An outbreak of cholera hit London in 1854. John Snow marked the deaths on a map. He announced that the water carried the disease. John Snow investigated two streets where the outbreak was very se
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