Unit 2 Success 延伸拓展阅读(PPT课件)-【满分思维】2026-2027学年高中英语选择性必修第一册配套课件（北师大版）

延伸拓展阅读 1 (节选自人教版选择性必修第二册 Unit 1) JOHN SNOW DEFEATS “KING CHOLERA” Cholera used to be one of the most feared diseases in the world, until a British doctor, John Snow, showed how it could be overcome. This illness causes severe diarrhoea, dehydration, and even death. In the early 19th century, when an outbreak of cholera hit Europe, millions of people died from the disease. As a young doctor, John Snow became frustrated because no one knew how to prevent or treat cholera. 延伸拓展阅读 2 In time, he rose to become a famous doctor, and even attended to Queen Victoria when she gave birth. However, he never lost his desire to destroy cholera once and for all. In general, doctors in those days had two contradictory theories to explain how cholera spread. One theory was that bad air caused the disease. The other was that cholera was caused by an infection from germs in food or water. Snow subscribed to the second theory. It was correct, but he still needed proof. Consequently, when an outbreak of cholera hit 延伸拓展阅读 London in 1854, Snow began to investigate. He discovered that in two particular streets the cholera outbreak was so severe that more than 500 people died in ten days. He was determined to find out why. Snow began by marking on a map the exact places where all those who died had lived. There were multiple deaths near the water pump in Broad Street (especially house numbers 16, 37, 38, and 40). However, some households (such as 20 and 21 Broad Street, and 8 and 9 Cambridge Street) had had 延伸拓展阅读 no deaths. These people worked in the pub at 7 Cambridge Street. They had been given free beer, and so had not drunk the water from the pump. Snow suspected that the water pump was to blame. What is more, in another part of London, a woman and her daughter had died of cholera after moving away from Broad Street. It seemed that the woman liked the water from the pump so much that she had it delivered to her house every day. As a result of this evidence, John Snow was able to announce that the pump water carried cholera germs. 延伸拓展阅读 Accordingly, he had the handle of the pump removed so that it could not be used. Through this intervention, the disease was stopped in its tracks. The truth was that the water from the Broad Street pump had been infected by waste. Moreover, Snow was later able to show a link between other cases of cholera and the different water companies in London. Some companies sold water from the River Thames that was polluted by raw waste. The people who drank this water were much more likely to get cholera than those who drank pure or boiled water. 延伸拓展阅读 Through Snow's tireless efforts, water companies began to sell clean water, and the threat of cholera around the world saw a substantial decrease. However, cholera is still a problem. Each year, millions of people around the world get cholera and many die from it. Fortunately, we now know how to prevent cholera, thanks to the work of John Snow. Moreover, in his use of maps and statistics, Snow transformed the way scientists study diseases. For this reason, Snow is considered the father of modern epidemiology. 延伸拓展阅读 【好词好句积累】 1.frustrated adj.沮丧的 2.once and for all彻底地，一劳永逸地 3.contradictory adj.(相互)矛盾的；对立的；不一致的 4.subscribe to同意，赞成 5.multiple adj.数量多的；多种多样的 6.household n.家庭；一家人 延伸拓展阅读 8 7.accordingly adv.因此；相应地 8.tireless adj.不知疲倦的；精力充沛的；不觉疲劳的 9.It seemed that the woman liked the water from the pump so much that she had it delivered to her house every day. 这个 女人似乎非常喜欢水泵里的水，以至于她每天都会让人把水送到她家。 10.The people who drank this water were much more likely to get cholera than those who drank pure or boiled water. 喝这种水的人比喝纯净水或开水的人更容易感染霍乱。 延伸拓展阅读 9 $