单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,Book8 Unit 2,period 3,The return of the dinosaurs?,Book8 Unit 2,Review some knowledge about cloning.,Practice expressing and surpporting an opinion.,Reinforce the important language points of Unit2.,Learning objectives:,Learning objectives:,人教版高中英语选修八Unit2-Cloning-Period3ppt课件,人教版高中英语选修八Unit2-Cloning-Period3ppt课件,人教版高中英语选修八Unit2-Cloning-Period3ppt课件,Find the main idea for each paragraph,Fast reading,Find the main idea for each pa,Para1,The possibility of cloning and extinct wild animals has always excited film makers.And they are not the only ones!The popularity of films such as Jurassic Park,in which a scientist clones several kinds of extinct dinosaurs,proves how the idea struck a mixture of fear and excitement into peoples hearts.But in fact we are a long way from being able to clone extinct animals.Scientists are still experimenting with cloning mammals.This is because the cloning of mammals is still a new science and its story only began seriously in the 1950s as,Para1 The possibility of cloni,Find the main idea for each paragraph,()Explain the impossibility of cloning dinosaurs.,()Conclude that its just a dream.,()Introduce the topic of the passage.,Fast reading,Para 1,Find the main idea for each pa,Para2,From time to time people suggest that extinct animals like dinosaurs,can possibly be brought back to life through cloning.Unfortunately,with what we know now,this is either impossible or unsuitable.There are many reasons.,The initial requirement is that you need perfect DNA(which gives information for how cells are to grow).,All efforts of cloning an animal will be in vain if there is not enough diversity in the group to overcome illnesses.Diversity in a group means having animals with their genes arranged in different ways.The advantage is that if there is a new illness some of these animals may die,but others will survive and pass on the ability to resist that disease to the next generation.The great drawback to cloning a group of animals is that they would all have the same arrangement of genes and so might die of the same illness.Then none of them would be left to continue the species.,It would be unfair to clone any extinct animals if they were to live in a zoo.A suitable habitat would be needed for them to lead a natural life.,Para2 From time to time peop,Find the main idea for each paragraph,(,Para2,)Explain the impossibility of cloning dinosaurs.,()Conclude that its just a dream.,(,Para1,)Introduce the topic of the passage.,Fast reading,Find the main idea for each pa,Para 3 Based on what we know now,you cannot clone animals that have been extinct longer than 10,000 years.Actually,dinosaurs disappeared 65,000,000 years ago.So the chance of dinosaurs ever returning to the earth is merely a dream.,Para 3 Based on what we know n,Find the main idea for each paragraph,(,Para2,)Explain the impossibility of cloning dinosaurs.,()Conclude that its just a dream.,(,Para1,)Introduce the topic of the passage.,Fast reading,Para 3,Find the main idea for each pa,1.The film,Jurassic Park,is popular because _.,A.people are interested in the subject of cloning B.all the actors are dinosaurs,C.it was directed by a scientist who clones dinosaurs,D.it proves very interesting,Detailed Reading,Para1,:,The,popularity,of films such as,Jurassic Park,in which a scientist clones several kinds of extinct dinosaurs,proves how the idea,struck,a mixtrue of fear and excitement,into,peoples hearts,.,1.The film Jurassic Park is p,2.The reasons why a group of cloned animals all die of the same illness do NOT include _.A.they have the same arrangement of genes B.there isnt enough diversity in the group for it to overcome illnesses,C.the illness is a new one,D.their arrangement of genes can not resist that new disease,Para2,:All efforts of cloning an animal will be,in vain,if there is not enough,diversity,in the group to overcome illnesses.,some of the animals may die,but others will survive and pass on the ability to,resist,the disease.,they would all have the same arrangement of genes and so might die of the same illness.Then none of them would be left to continue the species.,2.The reasons why a group of,3.The writer of the text _.,A.is excited by the possibility of cloning fierce and extinct animals,B.believes that extinct animals can be brought back to life by cloning,C.thinks it impossible or unsuitable to clone extinct animals like dinosaurs,D.dreams of dinosaurs returning to the earth,Para3,:So the chance of dinosaurs ever returning to the earth is,merely,a dream.,3.The writer of the text _,We can infer from the text that _.,A.scientists are experimenting to clone dinosaurs,B.dinosaurs will never return to the earth,C.cloned animals will only live in the zoo,D.the DNA of dinosaurs can only survive 10000 year,Post-reading,We can infer from the tex,4.Fill in the blanks.,ordinary people,Reasons,diversity,suitable habitat,4.Fill in the blanks.ordinary,merely a dream,Conclusion,merely