b5u1 Reading great scientists 公开课优质课件

1、1. Who discovered that objects in water are lifted up by a force that helps them float?2. Who wrote a book explaining how animals and plants developed as the environment changed?3. Who invented the first steam engine?James Watt4. Who discovered radium?Marie Curie6. Who was the painter that studied d

2、ead bodies to improve his painting of people?Leonardo da vinci7. Who invented the earliest instrument to tell people where earthquakes happened.Zhang Heng8. Who put forward a theory about black holes?Whats the passage about?A.John Snow was a well-known doctor in London.B. The cause of Cholera was po

3、lluted water.C.The source of all drinking water should be examined.D.How John Snow collected, analyzed data and found the cause of the disease and solved it . Para.1 John Snow was a famous doctor in London-so expert, indeed, that he attended Queen Victoria as her personal physician. But he became in

4、spired when he thought about helping ordinary people exposed to cholera. This was the deadly disease of its day. Neither its cause nor its cure was understood. So many thousands of terrified people died every time there was an outbreak. John Snow wanted to face the challenge and solve this problem.

5、He knew that cholera would never be controlled until its cause was found.What might cause cholera?1. Cholera multiplied in the air. People absorbed this disease into their bodies with their meals.gathered information and marked them a mapHow did John Snow prove his idea?Broad StreetThe water from th

6、e pump may cause it.The water was from the river polluted by the dirty water from London.Whats wrong with the pump water?What was the supporting evidence? A woman and her daughter who lived far away but drank the water from the pump also died of cholera.The polluted water carried the virus.The sourc

7、e of all the water supplies be examined.Not to expose people to polluted water any more.John Snow carried out his research by _. A. Making experiments B. Making comparison C. Making fact inference(事实推理事实推理) D. Making hypothesis(条件假设）条件假设） John snow-a doctor, Queen Victoria as her personal physician.

8、 But he was willing to help ordinary people cholera. Many people died every time there was an . He wanted to face the and solve the problem. Two theories caught his attention. The first suggested that cholera multiplied in the air. The second suggested that people this disease into their bodies and

9、the disease attacked the body. John Snow the second was right but he needed evidence. When another outbreak hit London in 1854, he was ready to begin his and tried to get information. He found that most of the deaths were near a water pump and the spread of the disease was 8 water. With the evidence

10、, he was able to that polluted water carried the virus. After that, he suggested the source of all the water supplies be examined. Finally “King Cholera” was .find a problemmake up a questionanalyze the resultscollect resultsdraw a conclusionfind supporting evidencethink of a methodfind a problemmak

11、e a questionthink of a methodcollect resultsanalyze the resultsfind supporting evidencedraw a conclusion1. What was the problem of that time?3. How did he practice his idea?4. Analyze the results, make breakthrough. 2. What an idea did he make up?find a problemmake up a questionanalyze the resultsco

12、llect resultsdraw a conclusionfind supporting evidencethink of a methodfind a problemmake a questionthink of a methodcollect resultsanalyze the resultsfind supporting evidencedraw a conclusionfind a problemmake up a questionanalyze the resultscollect resultsdraw a conclusionfind supporting evidencet

13、hink of a methodfind a problemmake a questionthink of a methodcollect resultsanalyze the resultsfind supporting evidencedraw a conclusionWhat was the problem?Analyze the methodsDraw a conclusionWhat was his new idea?How to practice his idea?Make a breakthroughWhat was the problem?How did he prove hi

14、s idea?Draw a conclusionWhat was his idea?_linking wordsvariety of languageFirst of allIn additionfinallyPast tense_爱迪生发明电灯爱迪生发明电灯 以前，油灯。这种灯有浓烈的黑烟和刺鼻的臭味。更严重的是，这种灯很容易引起火灾。爱迪生想发明一种既安全又方便的电灯。 首先选择用碳丝做灯泡，很快就失败了，但他却发现灯泡内必须是真空状态。随后选择用熔点较高的白金，但它的燃烧时间仍然很短。爱迪生并不气馁，先后试用了钡、钛、锢等各种稀有金属，效果都不很理想。 爱迪生总结了之前试过的材料，有1600种之多。终于，他发现竹丝燃烧的时间更长，1200个小时。到1906年，爱迪生又改用钨丝来做，使灯泡的质量又得到提高，一直沿用到今天。 当人们点亮电灯时，每每会想到这位伟大的发明家