unit-1-Great-scientists伟大的科学家.ppt

Who is he?Who is he?He is Archimedes (Archimedes (阿基米德阿基米德) )Which scientist discovered that objects in water are lifted up by a force that helps them float?Charles Darwin.Charles Darwin.Who is he?Who is he?He is Who wrote a book explaining how animals and plants developed as the environment changed?Thomas Newcomen.Thomas Newcomen.Who is he?Who is he?He is Who invented the first steam engine?Gregor MendelGregor MendelWho is he?Who is he?He is Who used peas to show how physical characteristics are passed from parents to their children?Marie CurieMarie CurieWho is he?Who is he?She is Who discovered radium?Thomas EdisonThomas EdisonWho is he?Who is he?He is Who invented the way of giving electricity to everybody in large cities?Leonardo da VinciLeonardo da VinciWho is he?Who is he?He is Who was the painter that studied dead bodies to improve his painting of people?Humphry DavyHumphry DavyWho is he?Who is he?He is Who invented a lamp to keep miners safe underground? Stephen HawkingStephen HawkingWho is he?Who is he?He is Who put forward a theory about black holes?Infectious diseases can be spread to other people. They have an unknown cause and need public health care to solve them.2. What do you know about infectious diseases?bird flu. AIDS, SARS are infectious diseases.Infectious diseases are difficult to cure. Cholera infects peoples intestines(肠胃肠胃), causing diarrhea(腹泻腹泻), vomiting(呕吐呕吐) and leg cramps (小腿抽筋小腿抽筋).3. What do you know about cholera?The most common cause of cholera is by someone eating food or drinking water that has been contaminated(污染污染) with the bacteria. Cholera can be mild(不严重不严重的的) or even without symptoms(症状症状), but a severe case can lead to death without immediate treatment.John SnowRead the text (P2-3) quickly and Read the text (P2-3) quickly and complete the main idea of plete the main idea of it. The text is mainly about _ and how he _.Johndefeated choleraSnowI. To prove a new scientific idea, seven stages are needed. Read the text (P2-3) carefully and fill in the blanks.cause absorbed multipliedcuremap provesourceBroad StreetMany deaths happened here.No death happened here.The water from the pump was to blame.Public house drinking the water Polluted waterexaminedextra evidence: A woman and her daughter who lived far away but drank the water also died.I. Choose the best answer.I. Choose the best answer. We know from the text that John Snow _. had collected information before cholera broke out B. felt not quite sure after he finished the mapC. helped the woman from Broad StreetD. became famous after defeating cholera2. Why did John Snow use a map in his research? It could help him find exactly how many people died of cholera.B. It could help him find the source of drinking water for people.C. It could help him organize his ideas and find evidence.D. It could help him find his way in Broad Street.3. Why was cholera called “King Cholera” in the text? Because it caused many deaths. B. Because it got its name from Queen Victoria.C. Because it was defeated with the help of the King. D. Because it was the most deadly disease of its day. Number these events in the Number these events in the order that they happened. order that they happened._ John Snow began to test two theories._ An outbreak of cholera hit London in 1854._ John Snow marked the deaths on a map. 124_ He announced that the water carried the disease._ John Snow investigated two streets where the outbreak was very severe._ King Cholera was defeated._ He found that most of the deaths were near a water pump._ He had the handle removed from the water pump.35678 Drink only water that you have boiled or treated with chlorine or iodine. Other safe drinks include tea or coffee made with boiled water and carbonated, bottled beverages with no ice.What should you do if youre travelling to a country that has a cholera outbreak? Eat only food thats been thoroughly cooked and is still hot, or fruit that youve peeled yourself. Avoid undercooked or raw fish and shellfish. Avoid raw salads and vegetables. Avoid food and drinks from street vendors. Boil it, cook it, Boil it, cook it, peel it, or forget it.peel it, or forget it.