公开课 Unit2 Cloning.ppt

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1、ReadingCloning:WhereisitLeadingus?Inpairs,lookatthesepicturesanddiscusswhichonesarenaturalclonesandwhichonesareman-made.Explainhowtheydiffer.Discussion一株草莓依靠它沿地“爬走”的匍匐茎,一年内就能长出数百株草莓苗NaturalcloneTwinsTheyarebornnaturallyandidenticalinsexandappearance.Natura

2、lcloneDolly是世界上第一例用体细胞─乳腺上皮细胞,通过细胞核移植技术,在复杂的人工操作下,得到的一只小绵羊。Whatisaclone?Howisacloneproduced?ReadingPleaseListentothetapeandgetthemainidea,andthenfinishthefollowingexercisesingroups.Themainideaofthetextis____A.animalcloningisveryvaluableandcanbenefittheworl

3、d.B.animalcloningcouldbemisusedbybadpeoplesoitmustbeforbiddenC.animalcloningiswelldevelopedbecauseDollythesheepwasborn.D.animalcloningraisedargumentsandscientistsarenotsureaboutitsfuture.主旨大意2.WhichofthefollowingstatementsaboutcloningisNOTtrueaccordingtote

4、xt?__A.Cloningissomethingthathasbeendevelopedquiterecently.B.Twinsthatlookexactlythesameareoriginallyfromthesameegg.C.Cloningisusedbygardenerstomakemoremoney.D.Animalcloningismuchmoredifficultthanplantcloning.细枝末节A3.ThecloningofDollythesheepsucceededbecaus

5、e____.A.itseasiertocloneasheepthanotheranimalsB.thescientistsweredeterminedandworkedhardwithpatienceC.thescientistswererewardedandgotlotsofmoneyD.manyotherattemptstoclonemammalsfailedB4.Thesheepthatdonatedthesomaticcellmostprobablylived____years.A.3B.6C.9D

6、.12推理判断5.DollythesheepA.lookedexactlylikethesheepthatprovidestheeggB.wastheexactcopyofthesheepthatprovidesthenucleusC.lookedlikethesheepthatgavebirthtoitD.hadthecharacteristicsofallthreesheep6.Whataboutthewriter’sattitudetowardcloninginthispassage?A.Object

7、ive(befair)B.Negative(beagainstit)C.Positive(beinfavorofit)theauthordoesnotstateanypersonalopinionaboutcloning.Because_________________________________________________________________观点态度MainideasReadthepassageandfindoutthemainideaofeachparagraph.Para.1The

8、definitionofcloningPara.2ThemajorusesandproceduresofcloningPara.3TheproblemsofDollyPara.4TheeffectofDollyPara.5People’sreactiontocloning“多利”的诞生标志着克隆研究取得新的进展和重大突破,而且这个结果证明:动物体中执行特殊功能,具有特定形态的所谓高度分化的细胞与受精卵一样具有发育