题目

As a well-known doctor in London, John Snow was willing to help ordinary people   56  (expose) to cholera. He knew that only when   57   cause of it was found could the   58  (dead) disease be controlled. He has two theories in mind explaining how cholera killed people.   59  was that cholera multiplied in the air without reason; the other was   60   people absorbed it into their bodies   61   their meals. After many   62  (investigate), he found the drinking water was to blame because the river   63  (pollute). Immediately John Snow told the people to remove the handle from the water pump   64    that it could not be used. Soon the disease began to slow down. To prevent the disease from   65  (happen) again, the water companies were instructed not to expose people to polluted water any more. Finally "King Cholera" was defeated. 答案：56. exposed  57. the  58. deadly   59. One   60. that   61. with   62. investigations   63. had been polluted   64. so   65. happening

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