Book8Unit2Warming-up&Reading.ppt

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1、Warming upHow much do you know about clone?What is clone?It is a way of making an exact copy of another animal and plant.克隆克隆”一词源于一词源于“CloneClone”的音译，指的音译，指的是人工诱导动、植物的无性繁殖过程，的是人工诱导动、植物的无性繁殖过程，这门生物技术就叫克隆技术。无性繁殖这门生物技术就叫克隆技术。无性繁殖是指不经过雌雄两性生殖细胞的结合，是指不经过雌雄两性生殖细胞的结合，只由一个生物体产生后代的生殖方式，只由一个生物体产生后代的生殖方式，如：由植物的

2、根、茎、叶等经过压条或如：由植物的根、茎、叶等经过压条或嫁接等方式产生新个体。绵羊、猴子和嫁接等方式产生新个体。绵羊、猴子和牛等动物没有人工操作是不能进行无性牛等动物没有人工操作是不能进行无性繁殖的。繁殖的。Natural clone is one that occurs in a natural form of cloning without human help.Man-made clone is one that produced through human intervention(介入介入).1996 cloning sheeps2001 cloning cattle我国成功繁殖克隆

3、兔我国成功繁殖克隆兔 体形要比普通兔大许多体形要比普通兔大许多2002年年5月月中旬成功地中旬成功地繁殖了一只繁殖了一只胚胎细胞克胚胎细胞克隆兔。隆兔。2002 cloning cats第一只克隆宠物猫第一只克隆宠物猫克隆马及其克隆马及其“母母亲兼姐姐亲兼姐姐”2002年年4月十六月十六日美国第一头日美国第一头克隆牛克隆牛“艾米艾米”产下牛犊喜产下牛犊喜作妈咪作妈咪2005 cloning dogs克隆的荧光小猪克隆的荧光小猪(左左)和正常小猪和正常小猪(右右)In pairs,look at these pictures and discuss which ones are natural

4、clones and which ones are man-made.Explain how they differ.DiscussionA strawberry plantGrowing new plantsTwinsDolly the sheepShe was cloned while the others were born naturally.Dolly was a _ sheep.clonedHow does Dolly differ from other sheep?Reading Listen to the tape and find out the main idea of e

5、ach paragraph.Cloning is a way of making an exact copy of another animal and plant.What is cloning?It happens both in _ and in_.They can be cloned by _ and _.plantsanimalsthemselveshumansNatural cloneMan-made clonePara 1 The definition of cloning1.How many major uses do cloning have?Firstly,commerci

6、al Secondly,research2.When was the cloning of Dolly the sheep born?Para 21996The major uses and procedures of cloningAt first,the fact that Dolly developed _ in a natural way was _.Later,the news _she lived for six years,half the length of the life of the _ one was _.Finally,the problem that occurre

7、d to the scientists was that a cloned animal lives_ the original one.Para 3The problems of Dollynormallyencouragingorginalthatas long as/shorter than/longer thandisturbingshorter thanThe word“controversial”in para 4 probably means _.A.complicated B.arguable C.importantPara 4The impact of DollyTrue o

8、r 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.Para 5 Peoples reaction to cloningMany governments forbade reserch into human beings.the author does not state any personal op

9、inion about cloning.A.Objective(be fair)B.Negative(be against it)C.Positive(be in favor of it)The writers attitude towards cloningBecause_ The whole scientific world followed the progress of the first successful clone,Dolly the sheep.The fact 1 _she seemed to develop normally was very encouraging.Th

10、en 2 _(come)the disturbing news that Dolly had become seriously ill.一、课文填空一、课文填空解析：解析：1.引导同位语从句。引导同位语从句。解析：解析：2.倒装句。主语是倒装句。主语是the disturbing news,came是谓语。是谓语。thatcameCloning scientists were cast down 3 _(find)that Dollys illnesses were more appropriate to a much older animal.Sadly the same arbitrary

11、 fate affected other species,such as cloned mice.The question that occurred to the scientists was:“Would this be 4 _major difficulty for all cloned animals?”解析：解析：3.动词不定式表示原因。动词不定式表示原因。解析：解析：4.difficulty在此是可数名词。在此是可数名词。to findaAltogether Dolly lived for six years,half the 5 _(long)of the life of the

12、 original sheep.6 _her problems,Dolly successfully produced a lamb in a 7_(nature)birth.解析：解析：5.寿命的长度寿命的长度,用名词。用名词。解析：解析：6.表示表示“尽管尽管”。解析：解析：7.用形容词修饰名词用形容词修饰名词birth。lengthDespitenatural On the other hand,Dollys appearance raised a storm of objections and had a great impact 8 _the media and public ima

13、gination.9 _ became controversial.It suddenly opened everybodys eyes to the possibility of using cloning to cure serious illnesses,10_ even producing human beings.解析：解析：8.have a great impact on.表示表示“对对有重大影响有重大影响”。解析：解析：9.指代上文指代上文Dollys appearance。解析：解析：10.前后为递进关系。前后为递进关系。on Itand二、课文概括二、课文概括 Cloning is quite common for two major uses.Obviously,the procedure of cloning animals is more complicated.However,Dolly the sheep was a scientific breakthrough in 1996.Homework完成名师指津完成名师指津P25 第一，二题第一，二题