Module3Unit4HowLifeBeganOntheEarth教学设计.doc

Module3 Unit 4 How Life Began On the Earth教学设计教材内容：Reading部分讲述了地球上生命的起源，水的形成使得地球有别于其他星球，它使得地球上生命的诞生成为可能。科学家认为，地球上的生命首先诞生于水中，上百万年后，陆地上才长出绿色植物，随后出现了陆栖动物和水陆西栖动物。最初的动物卵化繁衍后代，后来出现了哺乳动物，人类也随之诞生了。文章最后讲述的现象发人深省：The earth may become too hot for lives on it. 它关系到地球上生命的未来。教学目标：1. 知识目标： To make the students get to know some knowledge about astronomy, the universe, the solar system and some information about different ideas about how life began on the earth.2. 能力目标: To develop the students reading ability.3. 情感目标： To stimulate the students love for science and astronomy.教学重点：To help the students to master different reading skills, especially the reading ability of understanding implied meaning of the author.教学难点：1. Retell the whole passage according to the given chart.2. Learn different reading skills for different reading purposes.教学方法：Task-Based Teaching; heuristic teaching; Self-exploration combined with the cooperation and exchange;Teaching procedures:Step 1 Lead inT: Well, boys and girls, just now, we have seen several pictures of animals on the screen. I would like to ask you a question. Who are their ancestors? I would offer two choices (monkey? Small plants in the sea?)S: Er. Small plants in the seaT: Are you sure?S: Small plants in the sea is the earliest life on the earthT: So do you know how the earliest life began on the earth ? any ancient stories about the beginning of life on the earth?S: 盘古开天辟地，女娲造人，上帝七日造人T: yeah, very good. But these are just legends and stories, do you believe them? Do you know any scientific idea or theory on the beginning of the world?S: T: You are not sure, right? Please turn to page 25 and Step 2 reading (1) Fast reading: look through the passage quickly.1) Try to match each paragraph with its main idea.2) Whats the main idea of the whole passage? A. how did water begin? B. how did earth begin? C. how did man begin? D. how did life begin?(2) Detailed reading1) How life began on the earth can be divided into two stages Stage 1 The development of _(para.1-3) Stage 2 The development of _(para.4-5)2) Stage 1 the development of the earth(3) Group work 1（见附图1） Give students a series of pictures of the development of the earth, ask students discuss in group and try to move the pictures into the correct blanks according to what they learned from para1-3 of the passage. Finally, invite one or two students to come to blackboard and move the pictures to correct blanks.(4) Stage 2 the development of lifeFilling the blanks after reading loudly together according to para.4-5._ in water are considered to be the earliest lives on the earth. The O2they supplied encouraged the lives of_. Slowly green plants grew on land, which were followed by _like insects & _. When the plants grew into_, _ appeared. Then _ developed but disappeared later, which made the rise of a totally different animal,_, possible, and finally _ spread all over the world.(5) Group work 2 Give students a series of pictures of the development of the earth, ask students discuss in group and try to move the pictures into the correct blanks according to what they learned from para1-3 of the passage. Finally, invite one or two students to come to blackboard and move the pictures to correct blanks.这是一个从“课前词汇预习”入手提问：动物的祖先是什么? 引导学生思考生物是怎么出现的？世界是怎么开始的？虽有古代传说，但不足信，科学的生命起源学说又是什么呢？同学们的好奇心和求知欲自然被撩起。让学生带着好奇和问题，阅读课文。1.简要阅读文章，让学生了解文章大意，为detailed reading 奠定基础。2.任务型形式，学生小组讨论，然后上台操作体验的模式，巩固所学的地球生命演化史3.任务型形式，学生小组讨论，然后上台操作体验的模式，巩固刚刚学到的地球形成史。4.以填空形式了解地球生命演化史5.以图文并茂的方式，步步以设问引导学生了解地球形成史。Step 3 Summary for reading Give students 14 envelopes in which there are 12 sentences and ask students to put these sentences into correct order. Four people as a group discuss and finish the task.承上启下的一步。4人小组讨论，并将信封里的纸条按顺序排列。一方面是对所学的地球形成史和生命演化史的通过小组讨论和实践操作内化为语言技能和能力。另一方面，为下一步的课文复述打好伏笔。Step 4 Post-readingSuppose you were an instructor of earth pavilion of Shanghai Expo. Now you are introducing“how life began on the earth” to visitors. What will you tell them?Ladies and gentleman, welcome to our pavilion. What I am going to tell you is how life began on the earth. The universe began with a Big Bang. Several billion years after the Big BangThank you for attention.以时下非常热门的世博会地球馆讲解员为身份，引导学生以另一种形式复述课文,学生兴趣盎然。T: after the arrival of human beings, what kind of problems do they cause?S: global warmingT: do you want to know how serious it is?S: yesT: I would offer you a clip of video about video Think about Step 5 Discussion Suppose you would be the few survivors of 2012 doomsday(世界末日）, What would you want to say to people who are living now? Please tell them what they should do to prevent the coming of doomsday? Please tell them what they should do to prevent the coming of doomsday?1 It was obvious that people has put too much carbon dioxide into the atmosphere2. What I want to tell them is that3. What is even more important is that（the above sentence patterns are for students reference）文章最后一段强调人类造成Global warming, 以电影2012为引子，引导学生思