Unit_1_Great_scientists讲课件[1] (2).ppt

What do you know about great scientists? Try the quiz . Warming up1.Which scientist discovered that objects in water are lifted up by a force that helps them float?Archimedes an ancient Greek mathematician & physicist2.Who wrote a book explaining how animals and plants developed as the environment changed?Charles Darwin British author of The Origin of Species 3.Who invented the first steam engine?Thomas Newcomen British, improved the first steam pump and turned it into a steam engine for taking water out of mines in 1712. James Watt improved it and turned it into the first modern steam engine used on the railways. 4.Who used peas to show how physical characteristics are passed from parents to their children?Gregor Mendel Czech (捷克人捷克人)5.Who discovered radium?Marie Curie Polish and French, won two Nobel Prizes6.Who invented the way of giving electricity to everybody in large cities?Thomas Edison an American inventor7.Who was the painter that studied dead bodies to improve his painting of people? Leonardo da Vinci Italian artist8.Who invented a lamp to keep miners safe underground?Sir Humphry Davy BritishMiniature Miners Safety Lamp 9.Who invented the earliest instrument to tell people where earthquakes happened?Zhang Heng Chinese, invented seismograph10.Who put forward a theory about black holes?Stephen Hawking a British astronomerWhat are the basic qualities of the great scientists as above?Discussionintelligent, modest, wise, unselfish, determined, hard-working, confident ,persistent,brave etc.Homework:Read the words and preview the reading. It is a kind of terrible caused by drinking dirty water and it caused a lot of deaths in the old times and it was very difficult to defeat.John Snow, a well-known doctor in the 19th century in London, defeated “King Cholera”. “For his persistent efforts to determine how cholera was spread and for the statistical mapping methods he initiated, John Snow is widely considered to be the father of epidemiology(流行流行病学病学). First Reading Write down the main idea of each paragraphPara 1:Para 2:Para 3:Para 4:John Snow was a famous doctor in London and he was kind enough to help the ordinary people with cholera.John Snow was interested in two theories about cholera.John Snow collected information to test the two theories.The map showed that the polluted water might be the reason for cholera. Para 5:Para 6:Para 7:The reason for cholera was that the source of the water（水源）（水源） was polluted. John Snow was sure enough that polluted water carried the disease of cholera.John Snow suggested how to prevent cholera from happening again.Steps:What/How?1.Find a problem2.Make up a question3.Think of a method4.collect resultsWhat causes cholera?Which theory is correct?Collect information on those who were ill or died and where they got their waterMark information on a map to find out where people died or did not die6.Repeat if necessary7.Make a conclusion5.Analyse resultsAnalyse the water to see if that is the cause of the illnessFind other evidence to make sure the conclusionThe water is to blame. The source of all drinking water should be examined.