英语选修八unit2公开课件

1、 Unit 2 cloning using language The Return of the Dinosaurs?我国成功繁殖克隆兔我国成功繁殖克隆兔 体形要比普通兔大许多体形要比普通兔大许多Step1：Warming-up克隆的荧光小猪克隆的荧光小猪(左左)和正常小猪和正常小猪(右右)Dolly是世界上第是世界上第一例用体细胞一例用体细胞乳腺上皮细胞乳腺上皮细胞,通通过细胞核移植技过细胞核移植技术术,在复杂的人工在复杂的人工操作下操作下,得到的一得到的一只小绵羊只小绵羊 。富贵竹插枝即活富贵竹插枝即活仙人掌每块落地就生根仙人掌每块落地就生根 一株草莓依靠它沿地一株草莓依靠它沿地“爬走爬走

2、”的匍匐茎的匍匐茎,一一年内就能长出数百株草莓苗年内就能长出数百株草莓苗思考：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(主观的主观的).objective客观的客观的, positive肯定的肯定的 impartial 公平的公平的 ar

5、bitrary武断的武断的 optimistic乐观的乐观的 pessimistic悲观的悲观的critical持批评态度的持批评态度的 cautious谨慎的谨慎的 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 (遗传变异遗传变异)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克隆利与弊克隆利与弊 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（重难句分析）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