英語選修八unit2公開課件

1、 Unit 2 cloning using language The Return of the Dinosaurs?我國成功繁殖克隆兔我國成功繁殖克隆兔 體形要比普通兔大許多體形要比普通兔大許多Step1：Warming-up克隆的熒光小豬克隆的熒光小豬(左左)和正常小豬和正常小豬(右右)Dolly是世界上第是世界上第一例用體細(xì)胞一例用體細(xì)胞乳腺上皮細(xì)胞乳腺上皮細(xì)胞,通通過細(xì)胞核移植技過細(xì)胞核移植技術(shù)術(shù),在復(fù)雜的人工在復(fù)雜的人工操作下操作下,得到的一得到的一只小綿羊只小綿羊 。富貴竹插枝即活富貴竹插枝即活仙人掌每塊落地就生根仙人掌每塊落地就生根 一株草莓依靠它沿地一株草莓依靠它沿地“爬走爬走

2、”的匍匐莖的匍匐莖,一一年內(nèi)就能長出數(shù)百株草莓苗年內(nèi)就能長出數(shù)百株草莓苗思考：思考： Do you think it is possible to clone dinosaurs?【vedio 1】Answer the following questions:1.Have you ever seen the film Jurassic Park? Do people like this film? What animals do you see in the film? Are they real dinosaurs? 2.Do you like dinosaurs? Can you see

3、them in our real life? Why?3. Do you think it is possible to clone dinosaurs? If not,why? Step2：Reading Listen to the tape and then Listen to the tape and then answer the following qustions. answer the following qustions. Reading-1scanningMatch the main idea with each paragraph.Para1 explain the imp

4、ossibility of cloning dinosaurs Para2 conclude that its just a dreamPara3 introduce the topic of the passage What is the writers attitude towards cloning the dinosaurs? A. Supportive. B. Neutral (中立的中立的). C. Negative (否定的否定的). D. Subjective(主觀的主觀的).objective客觀的客觀的, positive肯定的肯定的 impartial 公平的公平的 ar

5、bitrary武斷的武斷的 optimistic樂觀的樂觀的 pessimistic悲觀的悲觀的critical持批評(píng)態(tài)度的持批評(píng)態(tài)度的 cautious謹(jǐn)慎的謹(jǐn)慎的 indifferent冷漠的冷漠的 1. Scientists are still experimenting with cloning mammals because they think it can make money.2. The animals that have disappeared from the earth, like dinosaurs, can be brought back to life throu

6、gh cloning.3. If we can clone any extinct animals, we should let them live in a zoo.FFFtrue or falseGive some reasons why it is either impossible or unsuitable to clone extinct animals_ for its impossibilityv Perfect is needed.v There is not enough _ in the group.v A (n) _ would be needed for the cl

7、oned extinct animals.conclusionThe chance of dinosaurs returning to the earth is _.Reading -2 detail readingRead the text, then answer the following questions. ( Students can discuss in pairs. )1. Why shouldt you clone an extinct animal unless there is enough diversity in the group?2. Why is it wron

8、g to clone an extinct animal if it would have to live in a zoo?3. Why cant you clone the DNA of animals that have been extinct longer than 10,000 years?1. Why shouldt you clone an extinct animal unless there is enough diversity in the group? There will not be enough genetic variation (遺傳變異遺傳變異)in th

9、e group to be able to resist new illnesses.2. Why is it wrong to clone an extinct animal if it would have to live in a zoo? It is not a good idea to clone an animal that would have to live in a zoo because it is not a suitable habitat to develop and increase its numbers.The zoo is not a natural envi

10、ronment for a wild animal.3. Why cant you clone the DNA of animals that have been extinct longer than 10,000 years? The DNA of animals more than 10,000 years old is not suitable for cloning ,for it cant survive so long.Step 3: ArgumentvSome students support it Some students support it while others o

11、bject to it.while others object to it.v正方正方VSVS反方反方v克隆利與弊克隆利與弊 HonestlyHonestly，cloning has cloning has advantages and disadvantages. advantages and disadvantages. The most important thing is The most important thing is that we should use it that we should use it perly.Step 4：Discussion

12、and speakingvNow discuss in group which extinct animals below are worth restoring by meanings of cloning. Later I will ask some students to share his or her opinions.Auroch (1627)Dodo bird (1755)Quagga (1883)Step 5: Language pointsCan you find some important Language points（重難句分析）1.The popularity of the film，in which a scientist clones several kind of dinosaurs， proves how interested ordinary people are in the subject.2. Diversity in a group means having animals with their genes arr