北师大版高中英语选修7 Unit21 Lesson 3Scientific Breakthroughs教案.docx

1、北师大版高中英语选修7 Unit21 Lesson 3Scientific Breakthroughs教案Epidemics throughout history1.With new health threats on the rise, James Madison looks at epidemics throughout history. Bacteria and viruses have been around since the beginning of life on Earth and many of todays diseases have been existed as lon

2、g as humans have. It s important to look at the spread of diseases throughout history to discover the causes and effects of epidemics. 2.-Scientists now think that Justinians Plague was actually a disease called bubonic plague. They estimate that between 25% and 50% of the areas population died from

3、 the disease and think that the epidemic was one of the key causes of the fall of the Roman Empire. 4-5. In highly populated areas all over Europe, Asia, Africa and the Middle East, one half to one third of the population was lost to the Black Death. Less populated areas, mostly in northern Europe,

4、were less severely affected. 6. Another epidemic that started and spread in similar conditions was the Great Flu Epidemic of 1918( also called the Spanish Flu). It struck near the end of the first World War and continued after the war was finished. 7.-8. One epidemic that we havent forgotten yet is

5、the SARS epidemic of 2002/2003. it began with an abnormal lung disease in Guangdong Province and spread worldwide after Dr Liu Jianjun came to Hong Kong. He stayed at a hotel where the disease spread to four more people. When these people left the hotel and returned home, they spread the disease to

6、Canada, Hong Kong, Vietnam and Singapore. 9 -10.No one really knew much about SARS as it was completely new to physicians. Doctors werent sure how to treat it or prevent it and since most people had no natural defences against the disease. It was also harmful to the doctors and purses treating the S

7、ARS patients. Hospital staff, especially nurses, made up 21% of the cases. 11-A Having killed between 25 and 50 million people in 18 months. It is believed to be the most acute worldwide epidemic in history. More people died of the flu than died in the war. Yet, somehow, it has been forgotten by his

8、tory. B. Although aspects of modern life, such as widespread air travel, allowed the SARS epidemic to quickly expand across the globe, other aspects, such as improved communication technology and improved medical research techniques, allowed health experts the world over to share knowledge and work

9、together to stop the virus in its tracks. C In the 1330s, the bubonic plague returned , this time in Asia. It would spread rapidly and come to be known as “ The Black Death”. The conditions in much of Asia and Europe war, climate change, a lack of adequate food, crowded cities and a lack of basic he

10、alth routines-provided the perfect conditions for the disease to spread worldwide. D Over nine months, the number of global cases passed 8,000 and 774 people died. Although these numbers are much smaller than the number for other diseases such as TB or flu, which kill millions every year, the outbre

11、ak was still very alarming for a few key reasons. F. Epidemics are described in historical accounts as early as 430 BC and one of the earliest on record is Justinians Plague. It happened about 500-550 AD as Roman Emperor Justinian was attempting to rebuild and acquire more land for the Roman Empire.

12、 It swept through North Africa, the Middle East and Europe. （2）教案 小说人物形象归纳法Read a science article easily Teaching Aims: To read an article about epidemicsTo improve the Ss reading abilityTo improve the Ss speaking abilityLearning method: ConcludingTeaching procedure:Step 1: AddressingStep 2:Lead-in

13、1.Listen to the song “Tears in heaven” .2.Whats your feeling after hearing the song?3.Why was the singer so sad?4.What else may cause death?5.Epidemics can cause more deaths than anything else.Step 3: Read the text( 1 ) Read the title carefully and get some general ideas of the text1.Predict what wi

14、ll be talked in the text2.Read other titles and discuss what will be involved3.What is an epidemic?(show pictures about AIDS and bird flu, and ask the Ss to give their own answers)4.Which of the following diseases are epidemics?AIDS, cancer, headache, flu, heart disease, stomach-ache, TB, malaria, s

15、mallpox, SARS5.Causes of epidemics: virus6.Tracks of epidemics7.Epidemics in history ( 2 ) Find out the meanings of the different numbers and know more facts about the text1.Ask the Ss to find out the numbers in the text and to talk about the related facts about them 2.Give the Ss an example3.Ask th

16、e Ss to practise in pairs4.Ask questions in turns in class( 3 ) Know the fact about an event or phenomena in details(use a form to help you if necessary )1. Talk about the events and fill in the blanksepidemicsTimePlaceeffectSARS2002/2003G.D.-H.K.-Vm-Ca.-Sigdoctors nurses affected2. Guess the names

17、of the epidemics in the text3. Guess the names of the other epidemics( 4 ) To know the development of the article1.Show the sequencing exercise2.Show the ways to do this exercise3.Ask the students to do the exercise in the text( 5 ) conclusion:Step 4: Read another science article1.Discuss the title2

18、.Talk about some numbers3.Do the sequencing exercise Step 5: HomeworkFinish reading the new article and retell the text in your own words. (120words )附: (1) Tears in HeavenWould you know my nameif I saw you in heaven?Would you feel the sameif I saw you in heaven?I must be strong and carry onCause I

19、know I dont belong here in heaven.Would you hold my handif I saw you in heaven?Would you help me standif I saw you in heaven?Ill find my way through night and dayCause I know I just cant stay here in heaven.Time can bring you down, time can bend your kneesTime can break your heart, have you begging

20、please，begging please.Beyond the door theres peace Im sureAnd I know therell be no more tears in heaven.2. The History of Smallpox The Rise and Fall of a Disease1. The history of the rise and fall of smallpox is a success story for modern medicine and public health. Even though the disease has been

21、eradicated, the threat of its return has once again brought it to the forefront of public controversy.2.-3. Epidemics occurred in the North American colonies in the 17th and 18th centuries. At one time smallpox was a significant disease in every country throughout the world except Australia and a fe

22、w isolated islands. Millions of people died in Europe and Mexico as a result of widespread smallpox epidemics.4. The fall of smallpox began with the realization that survivors of the disease were immune for the rest of their lives. This led to the practice of variolation - a process of exposing a he

23、althy person to infected material from a person with smallpox in the hopes of producing a mild disease that provided immunity from further infection. The first written account of variolation describes a Buddhist nun practicing around 1022 to 1063 AD. She would grind up scabs taken from a person infe

24、cted with smallpox into a powder, and then blow it into the nostrils of a non-immune person. 5.-6.The next step towards the eradication of smallpox occurred with the observation by English physician, Edward Jenner, that milkmaids who developed cowpox, a less serious disease, did not develop the dead

25、ly smallpox. In 1796, Jenner took the fluid from a cowpox pustule on a dairymaids hand and inoculated an 8-year-old boy. Six weeks later, he exposed the boy to smallpox, and the boy did not develop any symptoms.7. -8. The modern vaccine that was licensed by the FDA was taken from a weak strain of vi

26、rus called the New York City Board of Health strain. It was produced by Wyeth Laboratories and licensed under the name Dryvax. 9.-10.In 1967 the World Health Organization (WHO) started a worldwide campaign to eradicate smallpox. This goal was accomplished in 10 years due in a large part to massive v

27、accination efforts. The last endemic case of smallpox occurred in Somalia in 1977. On May 8, 1980, the World Health Assembly declared the world free of smallpox. 11- A Jenner coined the term vaccine from the word vaca which means cow in Latin. His work was initially criticized, but soon was rapidly

28、accepted and adopted. By 1800 about 100,000 people had been vaccinated worldwide.B. The United States stopped vaccinating the general population in 1972, but continued to vaccinate military personnel. It was recommended that vaccination of military personnel stop in 1986, and vaccination was officia

29、lly stopped in military recruits in 1990.C.The origin of smallpox is uncertain, but it is believed to have originated in Africa and then spread to India and China thousands of years ago. The first recorded smallpox epidemic was in 1350 BC during the Egyptian-Hittite war. Smallpox reached Europe betw

30、een the 5th and 7th centuries and was present in major European cities by the 18th century.D. The last outbreak of smallpox in the United States occurred in Texas in 1949 with 8 cases and 1 death. Even though most of North America, Western Europe, Australia, and New Zealand were free of smallpox by

31、this time, other countries such as Africa and India continued to suffer from epidemics. D.By the 1700s, this method of variolation was common practice in China, India, and Turkey. In the late 1700s European physicians used this and other methods of variolation, but reported devastating results in so

32、me cases. Overall, 2% to 3% of people who were variolated died of smallpox, but this practice decreased the total number of smallpox fatalities by 10-fold. （3）Epidemics explained 教学反思一 教学设计,目的和思路、1.教材内容说明Epidemics explained 是北师大版教材选修模块7 的最后一个单元中的阅读课,介绍瘟疫在历史上的流行和发展, 文章生词量大, 有一定的教学难度. 2.教学目的学生通过阅读课文, 了解文中一些科普知识, 学会描述瘟疫的特点, 掌握阅读科普文章的一些方法3.课堂形