John Snow was a famous doctor ＿London-so expert ,indeed, that he attended Queen Victoria ＿her personal physician. But he became inspired when he thought＿helping ordinary people exposed ＿ chol
era. This was the deadly disease ＿its day. Neither its cause nor its cure was understood. So many thousands ＿terrified people died every time there was an outbreak. John Snow wanted＿ face the challenge and solve this problem. He knew that cholera would never be controlled until its cause was found. He became interested ＿two theories that possibly explained how cholera killed people. The first suggested that cholera multiplied ＿the air. A cloud ＿dangerous gas floated ＿＿until it found its victims. The second suggested that people absorbed this disease＿＿their bodies ＿＿ their meals. ＿＿the stomach the disease quickly attacked the body and soon the affected person died. John Snow suspected that the second theory was correct but he needed evidence. So when another outbreak hit London ＿＿1854, he was ready ＿＿ begin his enquiry. As the disease spread quickly ＿＿poor neighborhoods, he began＿gather information. ＿＿two particular streets, the cholera outbreak was so severe that more than 500 people died ＿＿ten days. He was determined＿＿find out why. First he marked ＿＿a map the exact places where all the dead people had lived. This gave him a valuable clue about the cause ＿＿ the disease. Many ＿ the deaths were ＿ the water pump ＿ Broad Street(especially numbers 16,37,38and40).He also noticed that some houses(such as 20 and 21 Broad Street and 8and 9 Cambridge Street)had had no deaths. He had not foreseen this, so he made further investigations. He discovered that these people worked ＿ the pub ＿7 Cambridge Street. They had been given free beer and so had not drunk the water ＿ the pump. It seemed that the water was ＿ blame. Next, John Snow looked ＿ the source ＿ the water ＿ these two streets. He found that it came ＿ the river polluted b＿ the dirty water ＿London. He immediately told the astonished people ＿Broad Street to remove the handle ＿ the pump so that it could not be used. Soon ＿＿ the disease slowed down. He had shown that cholera was spread ＿ germs and not ＿＿ a cloud of gas. ＿ another part ＿London, he found supporting evidence ＿ two other deaths that were linked ＿ the Broad Street outbreak. A woman, who had moved away from Broad Street, liked the water ＿the pump so much that she had it delivered ＿her house every day. Both she and her daughter died ＿ cholera ＿ drinking the water. ____this extra evidence John Snow was able ___announce _____ certainty that polluted water carried____ virus. To prevent this from happening again, John Snow suggested that the source________all the water supplies be examined. The water companies were instructed not ______ expose people ＿ polluted water any more.Finally "King Cholera" was defeated.
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