2014年高二英语（人教版选修8）教学精品课件：UNIT2 PERIOD Ⅰ.ppt

1、【美文阅读】Pandas can be saved by cloning?从1998年中国科学院动物研究所首席科学家、动物克隆与受精生物学学科带头人陈大元首次正式提出克隆大熊猫到现在，整整16年过去了，陈老仍然执著于此。然而保护大熊猫，究竟要不要通过克隆的方式呢？The move was considered as one of the 10 biggest achievements of science and technology in 1999.It won an award of 6 million yuan and further funding of 5 million yuan

2、for the project from the Ministry of Science and Technology.At first，two embryos were created from a surrogate mother(代母)cat who became pregnant after being injected with a blastocyst，but the experiment was abandoned after the cat died.Chen and his team then experimented with surrogacy on black bear

3、s.After three years of effort，a black bear became pregnant and the shape of a fetus(胎儿)could be seen on an ultrasound scan(超声波扫描检查)However，the research was stopped in 2005 because the fetus did not completely develop before the projects deadline.“Those who are against cloning have made their voices

4、heard throughout the research project on cloning giant pandas.Some people believe cloning goes against nature，but it is actually a pioneering technology.If successful，it is a way to save endangered animals，”Chen said.Some scientists take a different view.“While I agree that research on cloning is me

5、aningful，it is inappropriate to use giant pandas in this type of experiment.The number of pandas is limited and human beings have yet to master knowledge about pandas pregnancy.Cloning would do little to save the species，”said Wang Dajun，a researcher at the School of Life Sciences，Peking University.

6、In response，Chen said that he would continue his research.【诱思导学】1Do you think pandas can be saved by cloning？Why?_【答案】省略2Why are some scientists against cloning pandas?_【答案】Because they think cloning go against nature.教师用书独具演示教学目标本课时主要是通过学生对学案所给出的内容的学习，了解本课文中所出现的词汇，初步了解课文以及相关的背景知识，为下一堂课对课文的全面理解起到一个铺

7、垫作用。教学地位本单元的中心话题是“克隆”。克隆意为无性繁殖，克隆技术即是无性繁殖技术。1997年英国罗斯林研究所试验成功的克隆羊多莉是首次利用体细胞克隆成功的，它在生物工程史上揭开了新的一页。本单元内容具体涉及“什么是克隆”、“克隆羊多莉是如何诞生的”、“克隆的利弊”等。语言技能和语言知识都是围绕“克隆”这一中心话题设计的。目的在于让他们了解有关克隆的知识和科普文章的一些基本特征和写作方法，自己尝试写简单的辩论报告。新课导入建议可以通过让学生看和讨论教材P10的“热身”(Warming Up)的图片：克隆羊多莉、人类的双胞胎、草莓的自然无性繁殖以及插枝繁殖的植物等导入新课。要求学生分组讨论，

8、了解两种不同的克隆：自然克隆和人工克隆。为下面的阅读做好铺垫。老师要尽量给学生自主学习的时间和空间，通过自学、自做、自悟、自助等方式，让学生更好地体会和理解文章的内容。演示结束.篇章结构阅读P1112的Reading部分，然后完成下列表格Cloning：Where is it leading us？ParagraphMain ideaContents1The definition(定义)of cloningCloning is a way of making an 1._ another animal or plant.It happens both in plants and animals

9、.2The major 2._ of cloning Firstly，gardeners use it to produce commercial 3._.Secondly，it is valuable for research on new plant species and for medical research on animals.3The problems of DollyAt first she seemed to develop normally.Then came 4._ that she had become seriously ill，which 5._ cloning

10、scientists.Dolly lived only six and a half years，6._ the life of the original sheep.Cloning scientists wondered now to overcome the problems.4The effect of DollyIts appearance raised a storm of 7._ and had a great impact on media and public imagination.It also occured to people that they can cure se

11、rious illnesses and even to produce 8._ using cloning.5Peoples reaction tocloningGovernment became 9._.Some began to 10._ research into human cloning.Scientists still wonder whether cloning will help or harm us and where it is leading us.【答案】1.exact copy of2.uses3.quantities of plants 4the disturbin

12、g news5.cast down6.half the length of7.objections8.human beings9.nervous and more conservative10.forbid.语篇理解阅读P1112的Reading部分，选择最佳答案1What are people cloning now?AThey are cloning books and machines.BThey are cloning humans and animals.CThey are cloning trees，crops，grass，flowers，etc.，as well as anima

13、ls.2It can be inferred from the passage that a cloned animal_.Ausually lives as long as the original oneBusually lives longer than the original oneCusually lives shorter than the original one3The cloning of Dolly the sheep succeeded because _.Ait is easier to clone a sheep than other animalsBthe sci

14、entists were determined and worked hard with patienceCit is more useful than plants4From the passage，we can see _.ADollys original sheep lived 13 yearsBDollys baby was also a cloned oneCnewspapers did not disclose cloning sheep5We can use the skill of cloning to_.Abring about global peaceBcreate oth

15、er famous scientistsCcure some special diseases【答案】15C C B A C.课文缩写Cloning is a way of making an 1._ copy of another animal or plant.Cloning plants is 2._ while cloning animals is very complicated.It is a difficult task to 3._.Many attempts to clone mammals failed.But at last the determination and p

16、atience of scientists 4._ in 1996 with a 5._the cloning of Dolly the sheep.Dollys appearance raised storm of 6._ and had a great 7._ on the 8._ and public imagination.Altogether Dolly lived six and a half years，half the length of the original sheep.At present some countries began to reform their leg

17、al systems and 9._ research into human cloning，but other countries like China and the UK，continued to 10._ evidence of the abundant medical aid that cloning could provide.【答案】1.exact2.straightforward3.undertake4paid off5.breakthrough6.objections7.impact8media9.forbade/forbad10.accumulate.短语填空in favo

18、ur of；pay off；object to；from time to time；cast down；differ from；have an impact on1Jack is really having a hard timehe cant earn enough money to _ the debts.2 At the UN conference，China strongly _punishing the Arabic countries by force.3The people are much _ by many years of civil war.4Fashion design

19、ers are always changing styles of dress _ to make more money from ladies.5Are you _ the governments plan to build more railway lines?【答案】1.pay off2.objected to3.cast down4.from time to time5.in favour of.句型背诵1Cloning plants is straightforward while cloning animals is very complicated.克隆植物简单，但克隆动物就很复

20、杂了。2The fact that she seemed to develop normally was very encouraging.看来多莉是在正常地成长着，这很令人鼓舞。3Then_came the disturbing news that Dolly had become seriously ill.接着传来了多莉病重的坏消息。4Although at present human egg cells and embryos needed for cloning research are difficult to obtain，newspapers wrote of evil leaders hoping to clone themselves to attain their ambitions.尽管目前供克隆研究的人类的卵细胞和胚胎很难获得，报纸报道说，有些邪恶头目希望把自己克隆出来以实现他们的野心。