Great scientists（Period 2 Reading）
(3) two theories explaining the cause of cholera(4) john snow’s examination of the source of the water(5) evidence for the cause of cholera(6) the source of all water supplies(7) the spread of cholera by germs in polluted watersuggested answers: (1) (3) (4) (5) (7) are mentioned in the passage.second reading: skimming to find out the main idea for each paragrapht: skim each paragraph and find out the main idea for each one.when you want to find the main idea of each paragraph, you especially pay attention to the first sentence and the last one, which may help you find the main idea quickly.i will give you three minutes to do it.(the teacher offers three minutes for the students to do it.later asks some students to answer.)suggested answers: 教學資源集散地。" type="#_x0000_t75" ole=>third reading: detailed-reading to answer questionst: now, let’s read the passage carefully to learn about more details.later i will let you answer some questions and fill in the chart.let’s come to a group competition again.if you get your answer right, i’ll give you twenty marks.scientific report by john snowthe problemthe causeidea 1idea 2the methodthe resultsidea 1 or 2?why?the conclusion1.what problem existed in london at his time?2.how did cholera kill people?3.how did he prove the second theory was correct?4.what was the result after he looked into the cause of cholera?5.which idea was right?why?6.what conclusion did he draw?suggested answers: scientific report by john snowthe problemthousands of people died of cholera every time there was an outbreak.neither its cause, nor its cure was understood.the causeidea 1 cholera multiplied in the air without reason.idea 2 people absorbed this disease into their bodies with their meals.the methodhe began to gather the information.he marked on a map where all the dead people had lived and the map gave a valuable clue about the cause of the disease.he looked into the source of the water.the resultspolluted water carried the disease.people who drank the polluted water died of cholera.idea 1 or 2?why?idea 2 is correct.he found two other deaths in another part of london that were linked to the polluted water.with this extra evidence, he was able to announce that polluted water carried the disease.the conclusion“king cholera” was defeated.fourth reading: further understandingt: from the passage, we know that john snow believed that idea 2 was right.how did he finally prove it?if you get your answer right, i’ll give you thirty marks.