选修八unit2reading

“parent”inanaturalformofcloningwithouthumanhelp.Man-madecloneisonethatproducedthroughhumanintervention(介入).cactuspendulumorchid(吊兰)naturalcloningexamplesstrawberrytwinsnaturalcloningexamplesman-madecloningexamplesthefirstclonedcatDollythesheepIn1996,asheepcalledDollywasborn.Itisthefirstmammaltobecloned.Itisconsideredtobethegreatestsuccessinthedevelopmentofcloning.Shewasclonedwhiletheotherswerebornnaturally.ReadingTask1ReadthepassageandfindoutthemainideaofeachparagraphPara.1Para.2Para.3Para.4Para.5Cloningisawayofmakinganexactcopyofanotheranimalandplant.Cloninghastwomajoruses.TheproblemsofDolly.TheeffectofDollyItisforbiddentoclonehumanbeing.ReadingTask2DetailedReadingReadtheparagraph2andanswerthetwoquestions.Whatarethetwomajorusesofcloning?Whyisiteasiertomakecommercialplantclonesthananimalclones?Firstly,gardenersuseitallthetimetoproducecommercialquantitiesofplants.Secondly,itisvaluableforresearchonnewplantspeciesandformedicalresearchonanimals.CloningplantsisstraightforwardwhilecloninganimalsisverycomplicatedReadingTask3Readthe9sentencesbelowthepictureandgetfamiliarwiththeprocedureofcloning1.Fourfemalesheepparticipateinthecloningofanewsheep.2.Electricityisneededintheprocedure.3.SheepBprovidesasomaticcellfortheclone.4.Thelambistheexactcopyofthesheepwhichprovideseggcell.FTFTTheprocedureofcloningDollythesheepReadingTask4Readparagraph3,trytogetsomeinformationaboutDollythesheepafteryourreading,thenanswerthequestionsonthescreenwithyourbookclosed1.Whatwasthefirstclonefromanadultanimal?2.Atwhatagedidthisclonedie?3.Didshedeveloptheillnessofolderanimals?4.Whichonecanlivelonger,cloneonesorordinaryones?DollythesheepShewassixandahalfyearsoldYes,shebecameserioulyill.Ordinaryones.Gothroughparagraphfourandfive,trytofindouttheadvantagesanddisadvantagesofcloningComprehendingAdvantagesusingcloningtocureseriousillnesseshelpsaveendangeredanimalsproduceplantsofsimilarqualityforsalecloningplantscanbeusefulforresearchonnewplantspecies