题目

No one understood cholera and every time it came, thousands died. Neither its cause 61.______ its cure was understood. Queen Victoria's doctor, John Snow, wanted to find 62.______ how it was caused. When the disease came to London again in 1854, Snow noticed that most of the 500 people 63.______ died had drunk water from a water pump in Broad Street. Two other deaths were linked to the Broad Street outbreak. A woman and her daughter used the water from Broad Street pump and died. With the 64.________(support) evidence, he was able to announce 65._______ certainty that the water carried the virus. He concluded that the water was 66.___________(blame) and found that the pump's water came from a river 67.__________(pollute) by the dirty water from London dirty. After he told the 68.____________ (astonish) people to remove the handle from the pump and stopped people from using the pump, people 69.___________ (gradual) stopped dying. Snow suggested all source of water should be checked and water companies take care not to supply people with dirty water. In this way, cholera ___________(defeat). 答案：61.nor          62. out        63.who          64.supporting         65.with    66.to blame      67.polluted    68. astonished    69.gradually      70.was defeated

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