Unit1 Reading and thinking （ppt课件）-2022新人教版（2019）《高中英语》选择性必修第二册.pptx

1、Unit 1 Science and scientistsJohn Snow Defeats King CholeraLead in Are you familiar with these situations?Mask upGet vaccinatedSelf-isolation Positive measures are taken to fight against Covid-19.Besides Covid-19,what other kinds of epidemics(流行病)do you know?loss of liquid (缺水)severe vomiting (呕吐)di

2、arrhoea(腹泻)It begins in the and can without immediate treatment.Reading and ThinkingJohn Snow Defeats King Choleraanalyse the resultsask a questiondraw a conclusioncollect datafind a problemfind supporting evidencethink of a method1234567Who？What？When？Where？Why？How？Cholera be one of the most feared

3、diseases in the world,until a British doctor,John Snow,showed how it could.This illness severe diarrhoea,dehydration,and even death.In the early19th century,when an outbreak of cholera Europe,millions of people died from the disease.As a young doctor,John Snow became frustrated because no one knew h

4、ow to cholera.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 allcholera？The father of modern epidemiologyIt used to be one of the most feared.cause severe diarrhoea,dehydration,and eve

5、n death.no one knows how to prevent or treat cholera.cholera？In general,doctors in those days had two contradictory theories to explain how cholera spread.One theory was that bad air the disease.Another was that cholera was caused by an infection from germs in food or water.Snow subscribed to the se

6、cond theory.It was correct,but he still needed proof.Consequently,when an outbreak of cholera hit 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.Stag

7、e 1-2 find a problem/ask a questionthe seven stages Stage 3-7 Stage 4 collect data The truth was that the water from the Broad Street pump had been infected by waste.Q1:Whats the main idea of paragraph4?Q2:How can we prevent cholera?Q3:Whats the influence of Snows study on science?The truth was that

8、 the water from the Broad Street pump had been infected by waste.We should drink pure or boiled water.He helped people know how to prevent cholera.He transformed the way scientists study diseases by using maps and statistics.Reading for thinkingWhat made John Snow succeed in preventing “King cholera

9、”?1.2.3.4.GroupworkReading for thinkingscientific spiritsscientific methodsscientific success The scientist is not a person who gives the right answers but the one who asks the right questions.Science is a way of thinking much more than it is a body of knowledge.The science of today is the technology of tomorrow.