内容正文:
选择性必修二 Unit 1 Science and Scientists
John Snow Defeats “King Cholera”
Cholera used to be one of the most feared diseases in the world, until ______ British doctor, John Snow, showed how it could _______________(overcome). This illness causes severe diarrhea, dehydration, and even death. It was in the early 19th century _________ an outbreak of cholera hit Europe that millions of people died from the disease. As a young doctor, John Snow became ____________ (frustrate) because there was no cure ________ cholera. _______ time, he rose to become a famous doctor, ________ even attended to Queen Victoria when she gave birth________ a baby. __________, he never lost his desire to destroy cholera once and for all.
_______ general, doctors in those days had two contradictory ____________ (theory) to explain how cholera spread, one of __________ was that bad air caused the disease. The other was that cholera was caused by an ________ (infect) from germs in food or water. Snow subscribed _____ the latter theory. It was correct, but he still needed proof. ______________ (consequent), when London ___________ (hit) by an outbreak of cholera in 1854, Snow began to investigate. When _____________ (discover) that in two particular streets the cholera outbreak was so severe, he was determined to find out why.
Snow began by marking on a map the exact places __________ all those who died had lived. There were multiple __________ (death) near the water pump in Broad Street. These people ___________(work) in the pub at 7 Cambridge Street had been given free beer, and so had not drunk the water from the pump. Snow suspected that the water pump was ___________ (blame). What is more, in another part of London, a woman and her daughter had died of cholera after moving away from Broad Street. ________ seemed that the woman liked the water from the pump so much that she had it ___________ (deliver) to her house every day. As a result of this ___________ (evident), John Snow was able to made