Book8_Unit2_Cloning__Reading
高二英语选修8-Unit2-Cloning-Reading教学设计与高二英语教学反思
高二英语选修8-Unit2-Cloning-Reading教学设计与高二英语教学反思高二英语选修8 Unit2 Cloning-Reading教学设计与反思一. 教材分析本单元以Cloning为话题，旨在通过单元教学，使学生了解克隆技术的优缺点，学会表达和支持个人观点，能用所学的有关Cloning 的词汇去表述自己对这一新技术的观点和看法。
二. 教材重组从话题内容上分析，Warming Up 与Reading相一致；而从训练目的上分析与TALKING比较一致。
从教材份量来说，可将Warming Up和Reading整合在一起，设计成一节任务型“阅读课（精读课）”。
三.教学目标Teaching goals1. Target language目标语言a. 重点词汇和短语clone，commercial，producer，undertake，arbitrary，object，forbid，accumulate，cast down，object to，the media，in favour ofb. 重点句子It is a way of….The fact is that….The question that occurred is….2. Ability goals能力目标Enable the students to describe cloning: What is the advantages of cloning？What is the problems or dangers of cloning？What is your opinion of cloning？3. Learning ability goals 学能目标Help the students learn how to describe cloning.Teaching important points 教学重点How to describe cloning.Teaching difficult point 教学难点Help the students analyze the writing techniques of the article.Teaching methods 教学方法Skimming, task-based method and debate method.Teaching aids 教具准备A recorder, a projector and some slides.Teaching procedures & ways教学过程与方式Step I Lead-inShow some pictures of Dolly the sheep(多莉羊)、 A strawberry plant(草莓植物)、Twins（双胞胎婴儿）、Identical dogs(克隆狗)的图片，on the screen. Get students to look at the pictures and discuss:which ones are natural clones and which ones are man –made? Then explain how they differ.S: I think the twins are natural clones and the Dolly sheep is man-made.T: You are right! Can you explain how they differ?S: The twins were born at the same time, but the Dolly sheep is man-made.T: Anything else? Who want have a try?S: I think the identical dog is man-made.T: Good Job【设计说明】克隆技术是一门前沿科技，学生对此兴趣浓厚，利用幻灯片展示当今克隆技术产生出来的动植物照片，学生的兴趣被瞬间激发，注意力高度集中，学习的热情高涨。
英语：unit2-《cloning》-reading课件(新人教版选修8)
bad thing?
克隆人是福音, 还是恶兆？
Homework:
What happens next?
； ；
是那李天福与鞠沙河相比,也是相差拾万八千里.“凝月三叠浪！”鞠言,也不敢托大,他直接,就使用了凝月三叠浪呐种中品武学.凝月三叠浪虽然只是中品武学,但是被鞠言修复了缺陷之后,其威历,就是相对壹般の上品武学,也是略微高出壹些の.黑色の剑光,瞬息之间,凝聚成三层剑幕.银色 の长河,与黑色剑幕,剧烈の碰撞.“砰砰砰！”两声の武学,在呐壹片擂台上方空间内,无比惨烈の相互倾轧、磨灭.“鞠沙河の元气,浑厚无比,并且化雾.单单论元气の量,其实俺并不比他差,甚至还些许超过他.但是,他化雾の元气,更为凝聚和精炼,在质上有着绝对优势.”“但是,他の武学, 有着致命の缺陷.”鞠言目光闪烁.如果鞠沙河の长河破灭剑法没有缺陷,那鞠言の凝月三叠浪,还真の抵挡不住.可惜,没有那么多如果.在天下第壹申技の引导之下,在几次交手后,鞠言就发现了长河破灭剑の部分缺陷,并且利用呐些漏洞,将那银色长河剑光,硬生生の从内部开始击溃.“哪 个?”鞠沙河,第壹次显露出有些慌乱の申色.没有声比他清晋,他现在の处境,也没有声比他自身清晋,鞠言の武学,已经渗透进他所施展の长河破灭剑法之中.“呐怎么可能?”鞠沙河,也想不通为何会呐样,他不知道鞠言是怎么做到の.就算鞠言修炼了上品武学,也不应该如此.而事实上,鞠言 施展の,明显才是中品武学凝月三叠浪.他明明应该占据优势,可是现实是,他在几次交锋后,就落于了下风.到目前为止,那些普通の陆家成员,还没有意识到呐壹点.但是,在高台之上の先天境界强者,却能看出其中の微妙.许多声,包括在贵宾席上の声,都为之动容.难道,呐鞠言！连半步先天の 鞠沙河,都不是其对手?…………………………（心塞！
【县公开课教案】人教版选修8教学设计：Unit 2 Cloning Reading
Module 8 Unit2 ReadingCloning：Where is it leading us?Analysis of the teaching material本课是人教版新教材选修8 Unit2 Cloning(Reading)，本课的中心话题是克隆。
本文具体介绍了植物与动物克隆的区别、多丽羊的诞生与死亡及由此引发的争论。
帮助学生进一步认识克隆的意义在于解决医学上的难题，为人类服务。
本节课是这篇阅读的第一节课，目的旨在让学生读懂文章的意思、了解文章的内容、把握文章的中心。
从而提升自己的阅读能力，要让学生学习了解克隆这门技术以及有关的争议。
Analysis of the learning condition:本节课的学习者特征分析主要是根据教师平时对学生的了解以及学生年龄段的思维发展情况而做出的：1)学生是尤溪一中高二年级的学生，有较强的求知欲和好奇心；对新教材有一定了解适应，自主学习习惯基本养成，对教师依赖性相对较低；2)学生有较多的阅读探究及任务型学习的经验；学生能够运用阅读技巧解决课后的相关阅读理解问题；3)学生在过去的生活经验中有与克隆Clone相关的知识储备；对新事物新技术有好奇心，思维活跃，但思考不够深入，逻辑性不强；Teaching objectives:1. Teaching aimsKnowledge aims:To know what is cloning, its benefits, problems, possible dangers as well as arguments and attitudes aroused by cloningAbility aims:1. To develop Ss’ different reading skills especially scanning for key words2. To develop Ss micro reading skill—word guessing3. Build up Ss’ confidence in speaking in EnglishEmotion aims:To be aware that the significance of cloning is to break medical limitation so as to benefit human beings2. Teaching key point and difficult pointTeaching key points:1. The definition of cloning and its benefits and drawbacks2. Developing students’ different reading skills especially scanning for key wordsTeaching difficult points:1. Method of word guessing2. To analyze the structure of an exposition3. Teaching and learning approach1. Task-based teaching approach2. Student-centered teaching approach3. Communicating and cooperating learning approaches4. Teaching aidsa projector and some slides.Teaching proceduresStep I Lead-inLead in the topic by watching a video and ask students what is the video about.Step II While-readingTask One : 1.Match the main idea with each paragraphPara. 1 Introduction/DefinitionPara. 2 Uses and procedurePara. 3 Problems of DollyPara. 4 Impact of DollyPara. 5 Different attitudes to human cloning2.What’s the main idea of the passage?3.Then Raise a question: What type of article is it? Exposition(说明文)Then introduce the features of an exposition:◆written in the third person◆in factual and formal language◆gives different points of view and does not try to persuade the reader to make up his mindTask Two: Detailed readingPara1：What is cloning? What does “it”refer to? When will “it” happen?Para2：What are the two major uses of cloning?Word guessing: “straightforward”When was the cloning of Dolly the sheep born?What did the scientists paid off with a breakthrough?How do scientists clone a sheep? Let’s watch a sho rt movie and give a right order of cloning Dolly ‘s procedurePick out the key verbs in the procedure and retell the procedure according to the key verbsPara3: Fill in the blanks1)At first, the fact that Dolly developed ________ in a natural way was __________.Later, the news ____she lived for six years and a half, half the length of the life of the ____ one was ____.Finally, the problem that occurred to the scientists was that a cloned animal lives_______ than the original one.2)The sheep that donated the somatic cell most probably lived ________years.A. 3B. 6C. 9D. 13Altogether Dolly lived six and a half years, half the length of the life of the original sheep.3)Problems:Cloned animals may develop the________of older animals.Cloned animals may lives __________than the original one.Para4: The impact of DollyIts’ appearance raised and the media and public imagination. Guess from context(上下文):The word “controversial” in Para 4 probably means :____________.A. complicatedB. arguableC. importantD. traditionalPara5: People’s reaction to cloningI.True or false:1)People feared that Cloned Hitlers would do harm to the world.2 )All the research into human beings will be forbidden.3)Some countries will use cloning in a wise way.II. The writer’s attitude towards cloning_____________.A. positiveB. negativeC. neutralD. unknownTask Three: SummaryCloning has always been with us and is here to stay. It’s a way of making an(exactly) copy of another animal or plant. Cloning has two major uses. Firstly, gardeners useit all the time to produce commercial quantities of plants. Secondly, it’s 2._ (value) for research on new plant species and for medical research on animals. Cloning animalsis a difficult task 3.(undertake). At last the determination and patience of the scientists paid 4.in 1996 with a breakthrough—the cloning of Dolly the sheep.The fact 5.she seemed to develop normally was very encouraging. Then camethe disturbing news that Dolly had become 6.(serious) ill and she only lived six and a half years. Dolly’s appearance raised a storm of 7.(object) and had a great impact on the media and public imagination. Newspapers wrote of evil leaders hoping to clone 8.(they) to attain their ambitions. Religious leaders raised moral questions. Now some governments have 9.(forbid) research into human cloning,10.others think cloning is useful for humans.Step IV Post readingDiscussion:Practice activity: Are you in favor of the human cloning or against it? Why？Useful expressions:Team A: I would like to suggest that ______________ .so in my opinion ,human cloning is good. Team B: I don’t agree with you . firstly, from the passage we know that_____________________. Secondly_____________________,Thirdly ,_______________. So I think the research into human cloning should be forbidden . Benefits:Gardeners use it all the time to produce commercial quantities of plants.It opened everyone’s eyes to the possibility to cure serious illnesses.It is valuable for research on new plant species and medical research on animals.Problems or dangers:Dolly’s illnesses were more appropriate to an older animal.Evil leaders may get themselves cloned to attain their ambitions.Religious leaders raised moral questions.Sum up : As a coin has two sides, everything has two aspects. On the one hand, if the cloning is used in a correct way it can bring many conveniences to us. Such as: curing serious illnesses and being used to produce commercial qualities of plants. On the other hand, if the cloning is used in an evil way it can cause much trouble: such as moral questions.教师寄语: One coin has two sides and we should treat things in a wise way.Step IV homeworkWrite a passage titled Is cloning goodor bad? Your passage should include the following：1)What is cloning 2)Advantages of cloning 3)Disadvantages of cloning4)Your opinion of itThe design of the blackboard:Unit2 Cloning-ReadingPara. 1 Introduction/DefinitionPara. 2 Uses and procedurePara. 3 Problems of DollyPara. 4 Impact of DollyPara. 5 Different attitudes to human cloningTeaching reflection:________________________________________________________________________________ ____________________________。
Unit2《Cloning》reading课件(新人教版选修8)
to get something, especially by asking for it, buying it, working for it or producing it from something else vt. 获得；赢得 obtain
Unit 2 Reading
CLONING: WHERE IS IT LEADING US?
Read the explanation and
speak out the word it explains.
an important discovery or event that helps to improve a situation or provide an answer to a problem n. 突破 breakthrough
a set of actions which is the official or accepted way of doing something n. 程序；步骤；手续 procedure
related to buying and selling things adj. 商业的；贸易的 commercial to do or begin to do something, especially something that will take a long time or be difficult vt. 着手；从事；承担 undertake
Read the passage quickly to find the main idea of each paragraph.
高二英语_选修8_Unit2_Cloning(Reading)_说课稿
高二英语选修8 Unit2 Cloning(Reading) 说课稿各位老师好，今天我说课的内容是选修八第二单元Cloning的Reading部分。
首先,我对本节教材进行一些分析:一、教材分析(说教材)；1. 教材所处的地位和作用：本课是人教版新教材选修8 Unit2 Cloning(Reading)，本课的中心话题是克隆。
本文具体介绍了植物与动物克隆的区别、多丽羊的诞生与死亡及由此引发的争论。
帮助学生进一步认识克隆的意义在于解决医学上的难题，为人类服务。
本节课是这篇阅读的第一节课，目的旨在让学生读懂文章的意思、了解文章的内容、把握文章的中心。
从而提升自己的阅读能力，要让学生学习了解克隆这门技术以及有关的争议。
2、教学目标：1）语言知识目标：A）使学生会使用本单元的相关词汇讲述克隆的概念，以及克隆带来的问题，及表达自己对克隆的认识。
B）初步掌握本单元重点词汇：here to stay; identical; straightforwa rd; undertake sth; cast down等。
2）语言技能目标：a)使学生学会克服生词障碍，通过略读，寻找文章的主题句，理清文章的总体框架与脉络；通过查读，捕捉文章的重要细节，理解作者的写作意图。
b) 使学生学会运用各种猜词技巧，猜测部分生词在具体的语言环境的含义3）情感态度与文化意识目标：通过对本文的学习，唤起学生对生活的关注，知道克隆的重要意义，以及克隆技术可能的利与弊，激发学生热爱科学的热情。
确立教学目标的依据：根据新课标要求，通过听、说、读、写四项基本语言技能的训练，使学生形成综合语言运用能力，激发学生的学习兴趣，为真实语言交际打基础。
此外，每一门课程都应该尽可能结合学科特点，把培养学生的情感融化到日常教育教学中。
3、重点与难点：重点：1．了解科技说明文的文体特点并以此指导阅读；训练skimm ing, scanning, fast reading ,careful reading等阅读技2．对文章深层次的理解及细节的欣赏，认识及了解克隆技难点： 1.阅读技能的训练；2．对科技说明文的鉴赏能力及事物的客观评价。
人教版选修8unit2 cloning-- reading(公开课课件)
Thinking
Oh! My God! I was cloned! Cloning people is a good thing ,or a bad thing? 克隆人是福音, 还是恶兆？
As a coin has two sides, everything has two aspects. On the one hand, if the cloning is used in a correct way it can bring many conveniences to us. Such
3. Which statement is NOT true ? A. Cloning is something that has been
developed quite recently. B. Twins that look exactly the same are
originally from the same egg. C. Cloning is used by gardeners to make more
as: curing serious illnesses and being used to produce commercial qualities of plants. On the other hand, if the cloning is used in an evil way it can cause much troubles: such as moral questions.
5. It is _f_o_rb__id_d_e_n__ to clone human beings.
Choose the right answer according to the text.
book8 unit2 Cloning
Para 5: People’s reaction to cloning
True or false: 1. People feared that Cloned Hitlers would do
harm to the world. T 2. All the research into human beings will be
1996 cloning sheeps
我国成功繁殖克隆兔 体形要比普通兔大许多
2002年5月 中旬成功地 繁殖了一只 胚胎细胞 克隆兔。
我国成功繁殖克隆兔 体形要比普通兔大许多
2002年5月 中旬成功地 繁殖了一只 胚胎细胞 克隆兔。
2005 cloning dogs
Pre-reading
Reading (修改）
Unit 2 Cloning
Reading
Twins
They are born naturally and identical in sex and appearance.
富贵竹插枝即活
The gardener should cut the plant, then the cutting produce another new plant.
3. The _p_r_o_b_l_e_m_s_ of Dolly.
4. The __e_ff_e_c_t__ of clonging in society.
5. The attitudes towards cloning.
Summary:
The passage mainly talks about cloning. Cloning has not only advantages but also causes arguments . People are concerning the future of cloning
人教新课标版高二选修8 Unit2 Cloning-Reading ppt课件1
4.What’s people’ fear about human cloning ? Which one is wrong? A.Cloned Hitlers would do harm to the world. B.Cloned people may be killed at will for medical aid. C.A woman would have difficulty recognizing her real husband. D.Men will die out because a woman can give birth to a baby without a husband.
Main ideas of the five paragraphs?
Para 1: What’s cloning? ( It is a way of making an exact copy of another animal and plant Para 2: Cloning has two major uses. Para 3: The problems of Dolly. Para 4 :The effect of Dolly. Para 5 :It is forbidden to clone human being.
Samples of Q3:
As a coin has two sides, everything has two aspects. First, if the cloning is used in a correct way it can bring many conveniences to us. Such as: curing serious illnesses and being used to produce commercial qualities of plants. On the other hand, if the cloning is used in an evil way it can cause much troubles: such as moral questions.
Book8 Unit2 Cloning 教学设计
Book8 Unit2 CloningReading内容：教学设计及反思_ 设计人：马艳霞___Book8 Unit2 CloningPeriod 1 Reading设计人: 马艳霞教学整体设计思路在英语教学中“阅读理解能力”是学生从阅读中获取信息的能力以及对文章理解的速度和准确性的关键因素。
培养学生的阅读能力是课文阅读教学的主要目标，同时还要注意培养学生在阅读过程中获取和处理信息的能力，让学生学会利用相关的英语知识去解读英语阅读材料。
本节课是一节阅读课，设计过程如下：导入引出克隆这一话题--- 掌握段落大意（略读）---课文内容填空（精读）---重点知识点与句型---讨论---写作拓展。
教材里本单元内容，语言技能和语言知识都是围绕“克隆”这一中心话题设计的。
具体涉及“什么是克隆”, “克隆羊多利是如何诞生的”，“克隆的利与弊”等。
教师可在充分利用教材资源的基础上，结合学生的实际情况设计教学活动，旨在帮助学生有效地掌握阅读技巧，形成有效地学习方法和阅读策略，同时了解说明文篇章结构和写作特点，为下一步进行议论文的写作教学做好准备。
目标聚焦一、知识点初步理解、掌握克隆意为无性繁殖，克隆技术即为无性繁殖技术。
学习课文中关于克隆这一新生物技术的有关知识，学习分析课文中的长难句子，初步感知课文中出现的的本单元要学的语法现象。
二、能力点1、能理解文章主旨大意，获取信息、处理信息、进行推理判断和表达的能力。
2、形成分析篇章结构的能力，提升逻辑思维能力3、学会增加语言的输出量，提高语言表达能力。
4、能利用上下文猜测生词词义三、兴趣点21、利用已获取的信息发表自己对进行人类克隆问题的看法。
2、克隆技术日新月异，在教授本单元时，需随时关注其发展的最新动态。
（四）德育点认识克隆人的危害———对人类在伦理、道德、法律等方面造成的巨大影响，应给予抵制。
学习流程Before class (课前自主学习，合作探究)Vocabulary（词汇预习）Preview the new words of this text.clone commercial producer undertake arbitrary object forbid accumulate bother regulation resist unable argument reasonable obtaincast down object to the media in favor of be bound to (do) from time to time pay off【设计意图】通过预习词汇为下一步的阅读扫清生词障碍。
Book8Unit2Cloning
Book8Unit2Cloningbook 8 unit 2 cloningwarming up and pre-readingⅰ. 背景阅读cloning is the technique of producing a genetically identical duplicate of an organism. a clone is said to be all descendants derived asexually from a single individual, as by cuttings, bulbs, by fission, by mitosis, or by parthenogenesis reproduction. it sounds very different and complicated to us.in fact, in our daily life, this happens often. for example, gardeners take cuttings from growing plants to make new ones. you often see that your mother picks a small branch from a growing plant to make a new one. if she likes this kind of flowers, she can do cloning. cloning also happens in animals or human beings when twins identical in sex and appearance are produced from the same original egg. the fact is that cloning plants is straightforward but the cloning of animals is more complicated.the possibility of human cloning, raised when scottish scientists at roslininstitute created the much-celebrated sheep "dolly", aroused worldwide interest and concern because of its scientific and ethical implications. she was the first mammal to be cloned from adult dna taken from an adult cell. previously, animals had only been cloned using embryo cells which already have the potential to become a complete embryo in its own right. the big breakthrough with dolly was to make a clone from an ordinary, adult cell −in this case from a female goat’s udder.1. fill in the blanks according to the passage.1) the definition of cloningcloning is a ________ of producing a genetically identical duplicate of an animal or a plant. it happens both in ______ and in_______. they can be cloned by _______ or humans. the former is_______clone while the latter is man-made clone.2) how does dolly differ from other sheep?she was ______ by humans while the others were born naturally.so, dolly was a ______ sheep.2. discuss the following questions.1). can you see any cloning happen in our daily life?2). what benefits can humans gain from cloning?3). what problems may arise when humans are cloned?4). should we clone a human?5). could cloning replace sex as the means of creating new human life?6). could a parent clone a child who is dying of a terminal illness?readingi. reading comprehension:1. the main idea of the text is____a. animal cloning is very valuable and can benefit the world. 共19页，当前第1页12345678910111213141516171819b. animal cloning could be misused by bad people so it must be forbidden.c. animal cloning is well developed because dolly the sheep was born.d. animal cloning raised arguments and scientists are not sure about its future.2.the cloning of dolly the sheep succeeded because____. a. its easier to clone a sheep than other animals b. the scientists were determined and worked hard with patiencec. the scientists were rewarded and got lots of moneyd. many other attempts to clone mammals failed3. what is the writer’s attitude toward cloning in this passage?a. the writer is against cloning.b. the writer is in favor of cloning.c. the writer is neutral towards cloning.d. the writer is in agreement with cloning.4. which of the following is not an advantage of cloning?a. cloning can be used for medical purposes.b. large quantities of food can be produced by cloning.c. cloning can help keep animals from becoming extinct.d. people can clone themselves at will.5. we can infer from the last three paragraphs that ___.a. the normal development of dolly had no effect on the cloning of other species.b. dolly’s serious disease and final death disturbed the whole world.c. dolly successfully cloned a new lamb with the help of cloning scientists.d. there were arguments about animals about animal cloning andconcerns about the future of cloning.6.what is the writing style?a. expositive （说明性的）b.descriptive 共19页，当前第2页12345678910111213141516171819c. argumentative （议论性的）d. narrativeii. fast reading: true or false questions1. cloning means making a copy of an animal or a plant.2. gardeners can make a lot of money by cloning plants.3. cloning animals is as complicated as cloning plants.4. dolly the sheep was the first successful clone of a mammal.5. natural clones happen in animals as well as in plants.iii. fill in the chart using the information from the text. add one reason of your own in each column.problems or dangers of cloningadvantages of cloninganimals may____________ ________ of older animals.medical cloning could _______ ______¬¬¬¬¬____ for serious degenerative(变质的）________ in humans.animal clones may _______________ than the donor animalscloning plants can _______________ of similar _________ ______ ______ .________ ________ may want to clone themselves.cloning plants can be _______ for research on _______ ______ ________ .there are ________ __________ to cloning human beings.cloning can help save ___________ _________ .ⅳ. writing用大约30个词概括课文的内容，然后根据以下要求写一篇文章。
选修8 Unit 2 Cloning Reading
Reading– Where is it leading us?
课前备好 :课本、提纲
exact cutting twin identical commercial
procedure nucleus somatic cell embryo carrier
fate make corrections object to objection have an impact (on)
Para.1 Para.2 The impact of Dolly the sheep. Controversy brought by Dolly the sheep.
Para.3
Para.4 Para.5
The definition of cloning
The birth and death of Dolly. The major uses and the procedure of cloning Dolly the sheep.
straightforward
complicated
cast
cast down
medium
the media
undertake
pay off
altogether
arbitrary
conservative
forbid,forbade,fe you for or against this idea?
Many governments forbade research 2 All the research into human beings will be into human beings. forbidden.
3 Some countries will use cloning in a wise way.
选修8 Unit2 Cloning-Reading
定 语, and even producing human beings作___
其中using和producing是______ 并列 关系。
2. On the other hand, Dolly’s appearance raised a storm of objections and had a great impact on the media and public imagination.
另一方面，多利羊的出现引起了一阵强烈的反对， 对媒体和公众的想象力也产生了极大的影响。 3. Newspapers wrote of evil leaders hoping to clone themselves to attain their ambitions. 报纸报道说有些邪恶头目希望克隆自己 以实现他们的野心。
produced through human
help .
【Lind out the main idea of the passage and some detailed information. • To understand the whole text and learn about what cloning is and its advantages and disadvantages.
What is cloning ?
Cloning is a way of making an exact copy of another animal or plant.
Para 2
1.What are the major uses of cloning ? The first use is to produce commercial quantities of plants. The second is to do research on new plant species and do medical research on animals. 2. How did the cloning of Dolly the sheep succeed? Because the scientists were determined and worked hard with patience.
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3. Evil leaders may want to clone themselves.
4. There are moral objections to cloning human beings.
Advantages of cloning
1.Medical cloning could produce cures for serious illnesses in humans. 2. Cloning plants can produce commercial quantities of plants.
Female sheep A
Female sheep B
An egg cell
The lamb is the clone of Sheep B
The
carrier
A somatic cell The nucleus The egg cell
Female sheep C Put into
The cell divides and grows into an embryo
problems of Dolly. 3.The _________
effect 4. The ________ of Dolly.
forbidden to clone human beings. 5. It is __________
• Natural clone is one that occurs from the “parent” in a natural form of cloning without human help. • Man-made clone is one that produced through human intervention。
3. Cloning plants can be useful for research on new plant species. 4. Cloning can help save endangered animals.
Sentence patterns
1. Cloning plants is straightforward while cloning animals is very complicated. 2. The fact that she seemed to develop normally was very encouraging.
examples of natural clones
orchid strawberry
twins
cactus
Cloned rabbit
Dolly the sheemade clones
克隆的荧光小猪(左)和正常小猪(右)
克隆马及其“母亲兼姐姐”
Fast reading
Read the passage, then try to find the main idea of each paragraph.
introduction/ definition of cloning 1.The __________________
procedure of cloning. 2.The________ and ___________ uses
genes
The nucleus is taken out of the somatic cell
The nucleus
They are
joined
Problems or dangers of cloning
• 1. Animal clones may develop the illnesses of older animals. 2. Animal clones may die younger than the donor animals.
3. Then came the disturbing news taht Dolly had
become seriously ill.
Homework: Suppose you are invited to give a speech about the problems or dangers and advantages of cloning humans to the students in English department. Write a short passage for the speech.