高二英语Unit2 Cloning Warming up Prereading Reading 新课标.ppt

Inpairslookatthesepicturesanddiscusswhichonesarenaturalclonesandwhichonesareman-made.Explainhowtheydiffer.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富贵竹插枝即活Dolly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。多利我国成功繁殖克隆兔体形要比普通兔大许多第一只克隆宠物猫克隆的荧光小猪(左)和正常小猪(右)Inpairsdiscusswhatyouunderstandaboutclothing.Thenlistthequestionsyouwanttofindout.Shareyourlistswithoneanother.Questionsaboutcloning2.Howisacloneproduced?3.Whatbenefitscanhumansgainfromcloning?4.Whatproblemsmayarisewhenhumansarecloned?Reading1.Themainideaofthetextis____A.animalcloningisveryvaluableandcanbenefittheworld.B.animalcloningcouldbemisusedbybadpeoplesoitmustbeforbidden.C.animalcloningiswelldevelopedbecauseDollythesheepwasborn.D.animalcloningraisedargumentsandscientistsarenotsureaboutitsfuture.2.WhichofthefollowingstatementsaboutcloningisNOTtrueaccordingtotext?A.Cloningissomethingthathasbeendevelopedquiterecently.B.Twinsthatlookexactlythesameareoriginallyfromthesameegg.C.Cloningisusedbygardenerstomakemoremoney.D.Animalcloningismuchmoredifficultthanplantcloning.3.ThecloningofDollythesheepsucceededbecause____.A.itseasiertocloneasheepthanotheranimalsB.thescientistsweredeterminedandworkedhardwithpatienceC.thescientistswererewardedandgotlotsofmoneyD.manyotherattemptstoclonemammalsfailed4.Thelambisthecloneofthecellfromsheepbecause_____.A.itprovidestheeggcellB.itgivesbirthtothelambC.itp