人教版选修8Unit2Cloningusinglanguage课件.ppt

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1、Unit2 Using LanguageReading,discussing and writingStep 1 lead-in If I give you a chance to clone,what will you restore then?What will you What will you restorerestore if if you have a chance?you have a chance?Step 2 Read and ansower1.Why shouldt you clone an extinct animal unless there is enough div

2、ersity in the group?2.Why is it wrong 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?2.There will not be enoug

3、h genetic variation in the 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 zo

4、o is not a natural environment 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 discussing May the best animal win!Which extinct anima

5、ls are worth restoring by means of cloning?Choose one and use the information to help you Choose one and use the information to help you argue why this animal should be restored to the argue why this animal should be restored to the earth.earth.Great Auk(1844)Auroch(1627)Dodo bird (1755)Quagga (1883

6、)I have chosen the second one-Dodo bird.I think my choice is the best for the fellow reasons:Firstly,the Dodo bird is friendly and not harmful.Then the human beings wouldnt be afraid of it.And humans would be friends with them.Secondly,Dodo bird s large eggs and tasty meat that could be developed fo

7、r food.If it is necessary,humans can take the advantage of these.Step 4 writingParagraph1:the topic of the debate and who wonParagraph2:the ideas of the winning sideParagraph3:the ideas of the other sideParagraph4:conclusion and your reaction to the debate,together with any idea you feel they left o

8、ut.A sample version:Should Medical Cloning be Allowed A Debate at Xinhua Middle SchoolYesterday there was a very exciting debate at Xinhua Middle School about whether medical cloning should be allowed or not.After a lively discussion a vote was taken and the side arguing for medical cloning won.The

9、arguments for medical cloning were very strongly put by the team supporting the motion.They argued that serious il-ln-esses and people who w losing their ability to move or think could be helped by medical cloning.They explained that the procedures would be safe,quick and with no problems for the pa

10、tients.They quoted that 67%of American citizens are for it to support their idea.Their arguments were very convincing.The arguments put by the team opposing medical cloning were less strong.They argued in two ways.The first reason was that the procedures were not yet secure.Their second reason was t

11、hat it took many tries and many potential animals had to be killed to produce one useable embryo for research.They explained that man European countries dont allow medical cloning research because of this.They quoted Pope John Paul.But their arguments were not so convincing.At the end of the debate the audience we left with a feeling of hope.They realized that diseases that seem terrible today may be able to be cured soon.Many people were excited and happy when they left they Hall.The writer of this article was among them!