高二英语选修8-unit2-cloning-课件.ppt

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1、Unit2CloningDollythesheepanditsbabyClonedrabbit克隆的荧光小猪(左)和正常小猪(右)克隆马及其“母亲兼姐姐”Reading–IScanningWritetheletter“T”ifthestatementistrue.Write“F”ifitisfalse.1.Cloningmeansmakingacopyofananimaloraplant.2.Gardenerscanmakealotofmoneybycloningplants.3.Cloninganimalsisascomplicatedascloningplants.FFT4.Do

2、llythesheepwasthefirstsuccessfulcloneofamammal5.Naturalcloneshappeninanimalsaswellasinplants.TT1.Itcanbeinferredfromthepassagethataclonedanimal_____.A.usuallylivesaslongastheoriginaloneB.usuallyliveslongerthantheoriginaloneC.usuallylivesshorterthantheoriginaloneD.isusuallyashealthyastheorigi

3、naloneReading2.WhichstatementisNOTtrue?A.Cloningissomethingthathasbeendevelopedquiterecently.B.Twinsthatlookexactlythesameareoriginallyfromthesameegg.C.Cloningisusedbygardenerstomakemoremoney.D.Animalcloningismuchmoredifficultthanplantcloning.3.ThecloningofDollythesheepsucceededbecause____.A.it

4、seasiertocloneasheepthanotheranimalsB.thescientistsweredeterminedandworkedhardwithpatienceC.thescientistswererewardedandgotlotsofmoneyD.manyotherattemptstoclonemammalsfailed4.Thelambisthecloneofthecellfromsheepbecause_____.A.itprovidestheeggcellB.itgivesbirthtothelambC.itprovidesthenucleusD.iti

5、safemalesheep5.Thesheepthatdonatedthesomaticcellmostprobablylived____years.A.3B.6C.9D.12CarefulreadingReadtheletteragain,thentrytofindthemainideaofeachparagraph.1.Cloningis______________________________2.Cloninghas____________uses.3.The_________ofDolly.4.The________ofDolly.5.Itis__________toclo

6、nehumanbeings.awayofmakinganexactcopyofanotheranimalandplant.problemstwomajoreffectforbiddenProblemsordangersofcloning1.Animalclonesmaydeveloptheillnessesofolderanimals.2.Animalclonesmaydieyoungerthanthedonoranimals.3.Evilleadersmaywanttoclonethemselves.4.Therearemoralobjectionstocloninghumanbe

7、ings.AdvantagesofcloningMedicalcloningcouldproducecuresforseriousillnessesinhumans.2.Cloningplantscanproduceplantsofsimilarqualityforsale.3.Cloningplantscanbeusefulforresearchonnewplantspecies.4.Cloningcanhelpsaveendangeredanimals