文档介绍：John Snow was born in York on March 15th, 1813, the oldest of nine children.
John snow
John Snow约翰斯诺
(1813-1858),英国麻
醉学家、流行病专家。他首次 提出了预防霍乱的措施。 1854年，伦敦霍乱流行，斯
诺通过研究霍乱病死者的日常 生活情况，寻找到他们的共同 行为模式，发现了霍乱与饮用 不洁水的关系，由于及时切断 了二者的联系，有效制止了霍 乱的流行。
What is Cholera?
Cholera is an infectious disease .It infects people's intestines（肠）， causing diarrhea（腹泻）,vomiting and leg cramps.
Bacteria / germs of cholera
1. Skimming
1). What's the main idea of the passage?
1
A. John Snow was a well-known doctor in London.
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B. The cause of Cholera was polluted water. J7|
C. The source of all drinking water should be examine港
^plow John Snow collected, analyzed data and found J7]
the cause of the disease and solved it. 可
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a
Read the first paragraph carefully .then answer these Questions
1 -What was the most deadly disease in 19th century?Why?
The cholera,because neither its cause,nor its cure was understood.
2-When could the cholera be controlled?
John Snow knew it would never be controlled until its cause was found.
Read paragraph 2 and answer the question：
3. What were the two theories explaining how cholera killed people?
A cloud of dangerous gas floated in the air then attacked victims.
People absorbed the disease with their meals.
Read the third paragraph then tell whether these sentences are true or false.