Great scientists（Period 2 Reading）
ss: john snow believed in the second theory but needed to prove he was correct.so when another outbreak hit london in 1854 and it spread quickly through the poor neighbourhoods, he began to gather the information.he determined to find out why.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 for broad street and cambridge street.he had shown that cholera was spread by germs and not in a cloud of gas.in addition, he found two other deaths in another part of london that were linked to the broad street outbreak.they died of cholera after drinking the polluted water.with extra evidence, he was able to announce that polluted water carried the disease.finally king cholera was defeated.t: you really did a good job.do you think john snow would have solved this problem without the map?why?if you get your answer right, i’ll give you thirty marks.s: i think he would have solved the problem.but he would spend more time in testing the two theories and it would be more difficult for him to look into the cause of cholera.(the teacher should give them about two minutes to discuss, and join in the discussion at the same time.after that, the students will be asked to show their opinions to the whole class.)step 6 consolidationt: in this period, we have learned a lot about john snow and king cholera.what have you learned from it?i will give you one minute to prepare for it.if your sentence is quite good, i’ll give you thirty marks.(after one minute.)s1: john snow was a well-known doctor in london.s2: he attended queen victoria to ease the birth of her babies.s3: he got interested in two theories explaining how cholera killed people.s4: john snow had shown that cholera was spread by germs and not in a cloud of gas.s5: john snow announced that polluted water carried the disease.s6: ...t: your sentences are so wonderful and amazing.i admire them very much.who would like to retell the whole passage to us?if you can, i’ll give you fifty marks.ss: ...step 7 topic discussiont: now let’s come to our topic.we know cholera was a 19th century disease.what disease do you think is similar to cholera today?why?if you show quite a good opinion, i’ll give you thirty marks.but first i will give you two minutes to discuss it with your partner.(the teacher should give them about two minutes to discuss, and join in the discussion at the same time.after that, the students will be asked to show their opinions to the whole class.)