Book 8 Unit 2 Cloning.ppt

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1、Watch a video:Questions:1.What is the key word in the video?2.What can it do?Watch a video:Watch a video:Questions:1.Technology（科技）（科技）.2.Technology has the _ to unite（团结）（团结）us.It gives hope to the _.It has given _ to the voiceless（无声的）（无声的）.powerhopelessvoiceHowever,one kind of technology is very

2、controversial(最具争议的最具争议的)，because even scientists dont know whether it will help or harm us.What is it?CloningHow much do you know about cloning?Background information of cloningThe following statements aim to check how much you know about cloning.Please decide T or F.1.There are two kinds of clonin

3、g.One is natural clones and the other is man-made ones.()2.Cloning only happens in animals.()3.Dolly the sheep is the first cloned animal.()TFFQuestionnaire of cloningnatural clonesman-made clonesCloning also happens in plants.Gardeners take cuttings from growing plants to make new ones.In 1996,a sh

4、eep called Dolly was born.It is the first mammal to be cloned.It is considered to be the greatest success in the of cloning.developmentActually,cloning began in the 1950s as the list shows:1950s cloning of frogs1970s research using the embryos(胚胎胚胎)of mice1979 work on embryos of sheep and mice1981 f

5、irst experimental(实验的实验的)clones of mice1983 first experimental clones of cowsThe development of cloning1996 first clone of a mammal:Dolly the sheep2000 cow gave birth to a bison2001 Chinas first cloned twin calves2002 first cloned cats2005 first cloned dogNext?Questions:1.What kind of animals do you

6、 see in this movie?Are they real ones?2.Do you think it is possible to clone(克隆克隆)them?a science fiction movie in 1993What kind of animals do you see in this episode?Are they real?Enjoy episode 1 of Jurassic Park A scientist _ many dinosaurs and brought them back to life.clonedDo you think dinosaurs

7、 will return to the world by cloning?Enjoy episode 2 of Jurassic Park Using language:Reading,discussing and writingBook 8 Unit 2 CloningREADING:THE RETURN OF THE DINOSAURS?Fast reading:Get the whole understanding of the passage Main idea of the passageMain idea of each paragraphWriting style of the

8、passageOutline of the passageThe writer of the passage _A.is excited by the possibility of cloning fierce and extinct animalsB.thinks it impossible or unsuitable to clone extinct animals like dinosaurs C.believes that extinct animals can be brought back to life by cloningD.dreams of dinosaurs return

9、ing to the earth1.Main ideaThe writer of the passage _A.is excited by the possibility of cloning fierce and extinct animalsB.thinks it impossible or unsuitable to clone extinct animals like dinosaurs C.believes that extinct animals can be brought back to life by cloningD.dreams of dinosaurs returnin

10、g to the earth1.Main ideatransitional wordtransitional wordcausality wordPara 1 conclude that its just a dreamPara 2 introduce the topic of the passagePara 3 explain the impossibility of cloning dinosaurs2.What is the main idea of each paragraph?A.Narration(记叙文记叙文)B.Description(说明文说明文)C.Argumentatio

11、n(议论文议论文)3.What is the writing style of the passage?the topic,reasoning and the proof4.The outline of the passageThe return of the dinosaurs?The introductionThe reasons for the impossibility of cloning dinosaursThe conclusionDetailed reading:Para 2:Give some reasons why it is impossible or unsuitabl

12、e to clone dinosaurs.Conclusion:cannot clone animals longer than 10,000 yearsthe returning of dinosaurs is merely a dream.Reason 1:You need perfect_.Reason 2:There is not enough _ for cloned animals to overcome new diseases.Reason 3:A lack of_.DNAdiversitya suitable habitatGreat aukGreat auk（1844184

13、4）大海雀）大海雀）大海雀）大海雀Aurochs(1627)原牛原牛 Dodo bird(1755)渡渡鸟渡渡鸟Quagga(1883)白氏斑马白氏斑马Four extinct animals died out less than 10,000 years agoNo 1I am a large wild cattle(牛牛).I have long horns(牛角牛角)and hair.My hair is good for making into clothes.My horns(牛角牛角)can be used for decorations(装饰装饰).I need grasslan

14、ds.Guessing game(Who am I?)Aurochs(1627)原牛原牛 No 2I am unable to fly.I am friendly and not harmful(有害的有害的).I need hot climate(气候气候).I lay large eggs(下蛋下蛋)and my tasty(美味的美味的)meat that could be developed for food.Dodo bird(1755)渡渡鸟渡渡鸟Guessing game(Who am I?)No 3I am a very large bird that cannot fly.I

15、 live by and in the sea.My feathers(羽毛羽毛)do notabsorb(吸收吸收)water and they are useful for protecting clothes from water.Great auk(1844)Great auk(1844)大海雀大海雀大海雀大海雀Guessing game(Who am I?)No 4My skin looks like a zebra(斑马斑马).My skin(皮肤皮肤)can be used for decoration(装装饰饰).My meat is very tasty(美味的美味的).I

16、need warm climate(气候气候).Quagga(1883)白氏斑马白氏斑马Guessing game(Who am I?)Discussion(group work):Among them,if only one can be brought back to life,which one will you choose?And why?Discuss it and write down the reasons on your paper sheet.Great aukGreat auk（18441844）大海雀）大海雀）大海雀）大海雀Aurochs(1627)原牛原牛 Dodo

17、bird(1755)渡渡鸟渡渡鸟Quagga(1883)白氏斑马白氏斑马Show time:(Share your ideas with us)Writing task 1:基于你们的讨论结果，写一篇基于你们的讨论结果，写一篇Lets bring _ back to life的报告，的报告，要求列举理由并说服别人。要求列举理由并说服别人。Before writing:要点突破：要点突破：1.体裁是什么？体裁是什么？_议论文议论文argumentation2.议论文的几种类型？议论文的几种类型？三种不同类型的议论文：三种不同类型的议论文：a.a.只介绍自己的观点只介绍自己的观点(给出观点，陈述理

18、由，重申给出观点，陈述理由，重申观点观点)b.b.分析利弊并给出自己的观点分析利弊并给出自己的观点c.c.只介绍两种不同观点只介绍两种不同观点议论文类型议论文类型1：只介绍自己的观点：只介绍自己的观点要点突破：要点突破：3.框架结构怎么做？框架结构怎么做？titlePara1:introduction paragraph(给出观点给出观点)Para2:bodyPara3:conclusion paragraph(重申观点重申观点)reason 1reason 2(陈述理由陈述理由)Lets bring the dodo back to life The dodo is the most sui

19、table animal to be brought back to life.Here are the reasons.Firstly,its friendly and not harmful,so we can keep it as pets for children.Secondly,its large eggs and tasty meat could be developed for food.Finally,farmers can sell its feathers as decoration.So I think the dodo would be the best choice

20、 to be brought back to life.Sample:Lets bring the _ back to life _ is the most suitable animal to be brought back to life.Here are the reasons.Firstly,_Secondly,_ Finally,_ So I think _ would be the best choice to be brought back to life.Writing your own oneCritical thinking:Think:If we really bring

21、 these extinct animals back to life,what benefits(好处好处)will people get?What problems(问题问题)do you think will arise(产生产生)?Group work:The following statements are about the benefits and problems of cloning extinct animals,please sort them out(分类分类).6.More species(物种物种)of animals can live in the world a

22、nd it is beneficial for biodiversity(生物的多样性生物的多样性).2.Cloning extinct(灭绝的灭绝的)animals will bring dead pets(宠物宠物)to life.5.It can promote(促进促进)our technology.1.As for some huge and fierce(凶恶的凶恶的)extinct animals,people may not have the power to control(控制控制)them.4.Some evil men(坏人坏人)may use these extinc

23、t animals to do something wrong.7.The land is so limited that we may not have enough space to build natural habitats(栖息地栖息地)for them.3.It may break(破坏破坏)the present balance of the nature.More species(物种物种)of animals can live in the world and it is beneficial for biodiversity(生物的多样性生物的多样性).Cloning ex

24、tinct(灭绝的灭绝的)animals will bring dead pets(宠物宠物)to life.It can promote(促进促进)our technology.Sort out the following benefits and problems of cloning extinct animalsBenefits:Sort out the following benefits and problems of cloning extinct animalsAs for some huge and fierce(凶猛的凶猛的)extinct animals,people m

25、ay not have the power to control(控制控制)them.Some evil men(坏人坏人)may use these extinct animals to do something wrong.The land is so limited that we may not have enough space to build natural habitats(栖息地栖息地)for them.Problems:It may break(破坏破坏)the present balance of the nature.议论文类型议论文类型2：分析利弊表明自己观点：分析利

26、弊表明自己观点Writing task 2：针对人类克隆已经灭绝动物的利弊，写一针对人类克隆已经灭绝动物的利弊，写一篇英语短文。篇英语短文。内容包括：内容包括：1.克隆已灭绝动物的益处；克隆已灭绝动物的益处；2.克隆已灭绝动物的弊端。克隆已灭绝动物的弊端。注意：注意：1.字数在字数在100字左右；字左右；2.开头已为你写出。开头已为你写出。要点突破：要点突破：1.体裁：体裁：议论文议论文.2.框架结构框架结构:议论文类型议论文类型2：分析利弊表明自己观点：分析利弊表明自己观点Para 1:introduction(导入话题导入话题&观点有分歧观点有分歧)Para 2-3:discussionP

27、ara 4:conclusion(表明自己观点表明自己观点)正方观点及理由正方观点及理由反方观点及理由反方观点及理由Sample:With the development of cloning,it may be possible to bring extinct animals back to life.The controversial issue of it has aroused wide concern in the public.The views of this issue vary from person to person.Some people are in favor o

28、f cloning extinct animals.Here are the reasons.Firstly SecondlyFinally However,the others are strongly against it.Their reasons are as follows.In the first placeWhats moreIn addition Personally speaking Technology of cloning is a double-edged sword.On the one hand,it can break backward(后退后退),on the

29、other hand,it may bring human endless disasters(灾难灾难).Its negative(消极的消极的)effects should not be overlooked(忽视忽视),only if we dont go against nature of way in the fairness(公平公平)and justice(正义正义)of heart,we can make development of cloning in right direction.My opinion of it Assessment(Summary)What have

30、 I learned in this lesson?知识知识能力能力情感情感1.Master words,word formation and expression2.Master reading skills3.Know how to write an argumentation1.I learn to cooperate with others2.I know how to find out the main idea and the specific information of the given material3.I can write two types of argumentations1.Technology of cloning is a double-edged sword.2.We should make development of cloning in right direction.Homework:1.Finish composition 2.2.Watch Jurassic Park,and it will bring you more thinking about cloning.