人教版高中英语选修八 Unit2 Cloning U2 Listening and speaking课件（共28张）

课件28张PPT。新课标高二版.选修八Cloning Unit 2Using language-Listening and speakingTrain the students’ listening and speaking abilities. Teaching aims:Step1 Pre-listening: look at some pictures about cloning.Step2 Is cloning cruel? Listen and see whether you agree with Qiao Qing or Rachel. Read these statements before listening. Tick those that you hear.1. Cloning will bring dead pets to life. 2. There were 627 experiments before Dolly was successfully cloned. 3. Cloning may help cure serious illnesses. 4. It’s a dead end. 5. Dolly the sheep was “middle-aged” when she was born. 6. So your grandmother would be able to start her life all over again and live much longer.Step3 Listen to the tape again and then work with a partner to fill in the chart.Answer:Listening textIS CLONING CRUEL? Xiao Qing (XQ) and Rachel Brown (RB) are discussing whether cloning is cruel to animals or not. RB: Xiao Qing, do you think cloning is cruel? XQ: What do you mean by that? The scientists are doing a wonderful job. Soon they may be able to bring people’s favourite pets back to life!RB: Yes, I know. But doesn’t it seem cruel to you that it took 276 experiments before Dolly was successfully cloned? Think of all those live cells and eggs that died in order for Dolly to be born. I don’t approve of that! XQ: But, Rachel, be reasonable. Isn’t it always like that with a new science? This is the way people learn to do things better.RB: I suppose so – but they also make the animals do such unnatural things. One poor cow was made to give birth to a bison. What was the poor creature to think when it saw its baby. XQ: I don’t quite understand why so many people are against cloning. I think the scientists need a bit of encouragement. Think of the benefits. Cloning may help medical science to produce cures for serious illnesses.RB: Yes, I know and I agree with that. It’s just that I don’t agree with the methods. XQ: Why not? RB: Well, I think it’s a dead end. Dolly the sheep was middle-aged when she was born because her DNA came from a middle -aged “mother”. Cloning your grandmother would mean a new baby started life as an old lady! XQ: Really? I never thought of that.RB: And it weakens the species. Cloning means that there's less variety in the species. So the animals may not be able to resist a particular illness and they might die out. XQ: Oh dear! And that was just what you and I were trying to avoid. In spite of all these, don’t you think scientists would still be able to sole the problems?Step4 Discussion Whose ideas do you agree with? Think about reasons for your point of view. The expressions below may be helpful to you. That’s a good idea. That’s a great idea! I support…because… Your argument has convinced me because… I agree with…because… Your ideas sound very encouraging to meSample dialogue:XIAO: I agree with animals cloning. I think we must be safe so animals are needed to test things first.LEI: No, I can’t agree with that because animals are a ... ...