选修八 2.2Unit 2　Extensive Reading .ppt

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1、新课标人教版课件系列,高中英语选修(模块）8-2.2,Extensive reading,克隆技术大事记,1938年:德国科学家首次提出克隆想。1952年:科学家开始用青蛙进行克隆实验。1970年:克隆青蛙实验取得突破,青蛙卵发育成了蝌蚪,但是在开始进食以后死亡。,1981年:科学家进行克隆鼠实验,据称用鼠胚胎细胞培育出了正常的鼠。1984年:第一只胚胎克隆羊诞生。1997年2月24日:英国罗斯林研究所宣布克隆羊培育成功。科学家用取自一只6岁成年羊的乳腺细胞培育成功一只克隆羊。,1998年2月23日:英国PPL医疗公司宣布,该公司克隆出一头牛犊“杰弗逊先生”。1998年7月5日:日本科学家宣布

2、,他们利用成年动物体细胞克隆的两头牛犊诞生。,1998年7月22日:科学家采用一种新克隆技术,用成年鼠的体细胞成功地培育出了第三代共50多只克隆鼠,这是人类第一次用克隆动物克隆出克隆动物。1999年5月31日:美国夏威夷大学的科学家,利用成年体细胞克隆出第一只雄性老鼠。,1999年6月17日:以美藉华人科学家杨向中为首的研究小组利用一头13岁高龄的母牛耳朵上取出的细胞克隆出小牛。2000年1月3日:美国著名华人杨向中,用体外长期培养后的公牛耳皮细胞成功克隆出6头牛犊。,2000年1月:美国科学家宣布克隆猴成功,这只恒河猴被命名“泰特拉”。2000年3月14日:曾参与克隆小羊“多利”的英国PPL

3、公司宣布,他们成功培育出5头克隆猪。,Please enjoy some pictures about dinosaurs.,霸王龙tyrannosaurus,剑龙stegosaurs,角龙 ceratopsids,雷龙 brontosaurus,翼龙pterodactyl,Please read the passage,and in pairs,answer the following questions.,1.The writer of the text_ A.is excited by the possibility of cloning fierce and extinct anima

4、ls B.believes that extinct animals can be brought back to life by cloning,主旨大意,C.thinks it impossible or unsuitable to clone extinct animals like dinosaurs D.dreams of dinosaurs returning to the earth,2.The film Jurassic Park is popular because_.A.people are interested in the subject of cloning B.al

5、l the actors are dinosaurs,细枝末节,C.it was directed by a scientist who clones dinosaursD.it proves very interesting,A,3.Which of the following is true?_Mice were cloned in 1981.B.Dolly the sheep was the first cloned animal.C.The name of the cloned cow is“Bison”D.China was successful in cloning mammals

6、.,4.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 oneD.their arrangement of genes can not resist that new disease,5.We can

7、infer from the text that_ A.scientists are experimenting to clone dinosaursB.dinosaurs will never return to the earthC.cloned animals will only live in the zooD.the DNA of dinosaurs can only survive 10 000 year,推理判断,1.The popularity of the film Jurassic Park,in which a scientist clones several diffe

8、rent kinds of extinct dinosaurs,proves how interested ordinary people are in the subject.,长句难句,电影侏罗纪公园的欢迎证实了普通人对这一话题是多么感兴趣,在该电影中一位科学家克隆了几种不同的恐龙。in which引导定语从句,how引导宾语从句。,2.From time to time people suggest that the animals that have disappeared from the earth,like dinosaurs,can possibly be brought ba

9、ck to life through cloning.人们时常设想从地球上消失的动物,例如恐龙,有可能通过克隆技术使它们复活。,from time to time有时,间或,偶尔,=occasionally,now and then。,3.It is useless to clone an animal if there is not enough diversity in the group for it to overcome illnesses.该群中如果没有足够的多样性使它克服疾病,克隆动物就没有用。,当动词不定式、动名词或从句作主语时,通常把它们放在谓语之后,而用it作句子的形式主语

10、。,4.Diversity in a group means having animals with their genes arranged in different ways.群中的多样性指的是拥有基因排列方式不同的动物。with their genes arranged in different ways作定语,in different ways 以不同的方式。,5.but others will survive and pass on the ability to resist that disease to their children.其他的将存活下来并传递给其后代抵抗这种病的能力。,resist 作及物动词主要有三个义项:抵抗,对抗;抵挡,防止;(与cannot,could not连用)无法抗拒,无法抵挡。,base on/upon 以为基础,依据其结构为:base sth.on/upon sth.is based on/upon,6.Based on what we know now,you can not clone animals that have been extinct longer than 10000 years.据我们现在所知,绝种一万年以上的动物不能克隆。,Finish Ex.1-2,Page16;Ex.3-4,Page17.,Homework,