人教课标版英语选修8unit2 reading 课件.ppt

Cloning:Whereisitleadingus?,人教课标版高二选修8Unit2,Inpairs,lookatthesepicturesanddiscusswhichonesarenaturalclonesandwhichonesareman-made.Thinkabouthowtheydiffer.,Warmingup,Dollythesheep,Itsthemostfamoussheepintheworld.DoyouknowhowDollyisdifferentfromothersheep?,Shewasclonedwhiletheotherswerebornnaturally.Itisthecopyofanothersheep.,man-madeclones,Whatcanyouseeinthepicture?,Icanseeastrawberryplantproducingrunnersinanaturalformofcloning.,naturalclones,Whocutthestemofftheplant?,Agardener.Andthegardenerisgoingtoputitintoapottoproduceanotherplant.Heisactuallymakingacopyoftheplant.,man-madeclones,Whatdoyouknowabouttwins?,Therearetwinsofthesamesexandthoseofdifferentsexes.Thetwinshereareidenticalinsexandappearanceandaregoodexamplesofnaturalclones.Theycarrythesamegeneticinformation.Thefertilizedegghassplitintotwowhileinsidethemother,andsoproducedtwoidenticalhumanbabies.,naturalclones,Arethefollowingclonesthesame?Ifnot,whatisthedifference?,NO.Thefirsttwoareman-madeclones,theresttwoarenaturalclones.,Pre-reading,Questionsaboutcloning:,1.Whatisaclone?,Acloneisananimalorplantproducednaturallyorartificiallyfromthecellsofanotheranimalorplantandisexactlythesameasit.,2.Howisacloneproduced?,Thecloningofplantsissimpleandrelativelyeasy.Itcanbedonebytakingcuttings(man-madecloning)orlettingtheplantproduceitsownrunners(naturalcloning).Thecloningofanimalsismorecomplicated.Itwasnotachieveduntil1996andisfullyexplainedinthefirstreading.,3.Whatbenefitscanhumansgainfromcloning?,1)Medicalcloningcanhelpcureseriousillnessesthatruinonesqualityoflife(suchasParkinsonsdisease帕金森症orAlzheimersdisease老年痴呆症).2)Itcanhelpinfertilepeoplehavebabies.,4.Whatproblemsmayarisewhenhumansarecloned?,1)Peoplemaywanttoclonethemselvessotheycanliveforever.2)Peoplemaywanttoclonedeadchildren.3)Peoplemaywanttoclonetheirfavoritepets.,Comprehending,I.Findthemainideaofeachparagraph.,Cloningisawayofmakinganexactcopyofanotheranimalandplant.Cloninghastwomajoruses.ThebirthanddeathofDolly.TheeffectofDolly.Itisforbiddentoclonehumanbeings.,Para1.Para2.Para3.Para4.Para5.,II.Readthetextcarefullyandfillintheblanks.,anexactcopy,produce,medical,normally,original,mucholderanimal,themselves,moral,forbade,evidence,1).Themainideaofthetextis_A.animalcloningisveryvaluableandcanbenefittheworld.B.animalcloningcouldbemisusedbybadpeoplesoitmustbeforbiddenC.animalcloningiswelldevelopedbecauseDollythesheepwasborn.D.animalcloningraisedargumentsandscientistsarenotsureaboutitsfuture.,III.Choosethebestanswer.,细枝末节,2._isusedintheprocedureforcloningDollythesheep.A.ThenucleusofSheepAB.ThesomaticcellofSheepAC.ThenucleusofSheepBD.TheembryoofSheepC,3).ThecloningofDollythesheepsucceededbecause_.A.itseasiertocloneasheepthanotheranimalsB.thescientistsweredeterminedandworkedhardwithpatienceC.thescientistswererewardedandgotlotsofmoneyD.manyotherattemptstoclonemammalsfailed,4).Thelambisthecloneofthecellfromsheepbecause_.A.itprovidestheeggcellB.itgivesbirthtothelambC.itprovidesthenucleusD.itisafemalesheep,5).DollythesheepA.lookedexactlylikethesheepthatprovidestheeggB.wastheexactcopyofthesheepthatprovidesthenucleusC.lookedlikethesheepthatgavebirthtoitD.hadthecharacteristicsofallthreesheep,6).Itcanbeinferredfromthepassagethataclonedanimal_.usuallylivesaslongastheoriginaloneB.usuallyliveslongerthantheoriginaloneC.usuallydiesearlierthantheoriginaloneD.isusuallyashealthyastheoriginalone,7).Whichofthefollowingiswrong?A.Clonedpeoplewouldliveforever.B.Clonedpeoplemaybekilledatwillformedicalaid.C.Awomanwouldhavedifficultyrecognizingherrealhusband.D.Menwilldieoutbecauseawomancangivebirthtoababywithoutahusband.,8).Thesheepthatdonatedthesomaticcellmostprobablylived_years.A.3B.6C.12D.13,推理判断,9).WhichofthefollowisNOTaproblemordangerofcloningmentionedinthetext?A.Evilleadersmaywanttoclonethemselves.B.Animalclonesmaydeveloptheillnessofolderanimalsandmaydieyoungerthanthedonoranimals.C.Therearemoralobjectionstocloninghumanbeings.D.Toomuchcloningmayleadtothedestructionofthebalanceofnature.,10).Whichofthefollowingisnotanadvantageofcloning?Cloningcanbeusedformedicalpurposes.B.Largequantitiesoffoodcanbeproducedbycloning.C.Famouspersonswhohavepassedawaycanbecloned.D.Cloningcanhelpkeepanimalsfrombecomingextinct.,11).Inthesecondparagraph,theword“straightforward”means_.A.uncomplicatedB.honestC.frankD.difficult,12).Fromthelastparagraphwecaninferthat_.A.cloningwillcometoanendbecauseoftheobjectionsB.clonedhumanbeingswillbeproducedinthenearfutureC.manycountrieswillusecloninginawisewayD.alltheresearchintohumanbeingswillbeforbidden,C,13.Whatispeoplesfearabouthumancloning?Whichofthefollowingiswrong?ClonedHitlerswoulddoharmtotheworld.Clonedpeoplemaybekilledatwillformedicalaid.Awomanwouldhavedifficultyrecognizingherrealhusband.Menwilldieoutbecauseawomancangivebirthtoababywithoutahusband.,14.Whatcanweknowfromthetext?A.Twinsaretheresultofnaturalclones.B.Cloningwillbenefitallofus.C.Itismoredifficulttomakeanimalclonesthancommercialplantclones.D.Dollythesheepwasthefirstclonedanimalintheworld.,C,Thewritersreactiontowardscloningis_A.PositiveB.NegativeC.neutral4,Whatisthewritingstyle?A.Expositive(说明性的)B.DescriptiveC.Argumentative(议论性的)D.Narrative,impartial不偏袒的，公平的objective客观的,1).Cloningmeansmakingacopyofananimaloraplant.2).Gardenerscanmakealotofmoneybycloningplants.3).Cloninganimalsisascomplicatedascloningplants.,F,T,F,4.Writetheletter“T”ifthestatementistrue.Write“F”ifitisfalse.,T,T,4).Dollythesheepwasthefirstsuccessfulcloneofamammal.5).Naturalcloneshappeninanimalsaswellasinplants.,Lookatthesepictures,anddiscussthisquestionwithyourpartner.,Iscloningpeopleagoodthingorabadthing?,Discussion,1.克隆技术现在还不成熟,克隆人可能有很多先天性生理缺陷。2.克隆人的身份难以认定,他们与被克隆者之间的关系无法纳入现有的伦理体系。,反对克隆人,3.克隆技术有可能被滥用,成为恐怖分子的工具。4.从生物多样性上来说,大量基因结构完全相同的克隆人,可能诱发新型疾病的广泛传播,对人类的生存不利。,1.“不让我们克隆人,就是不让我们修正我们的错误,人类历史难道能够这样构造吗？”纽约时报书评2.“当然应该克隆人,如果谁第一个掌握了这个技术,他就是我真正的、也是唯一的竞争对手。”比尔盖茨,支持克隆人,3.“克隆人绝对是科学上了不起的进步,克隆技术必将创造21世纪的辉煌。”麻省理工学院生命工程教授约翰布洛克4.“人体商业化是人类经济活动中无与伦比的成就,毫无疑问,克隆技术的出现将为世人创造一个最为广泛和深远的市场。”英国经济学家杂志。,Discussion,Whatdoyouthinkisthewritersviewinthisreadingpassage?2.Whatsyouropinionofcloning?Givereasons.,Ithinkthewriterisimpartialbecausehe/shedoesnotstateanypersonalopinionaboutcloning.,Doyouknowabout:,theprocedureworksofasheep?,克隆羊诞生图示,“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