人教版选修八Unit2 Reading .pptVIP

Unit2;Unit2

Cloning;;Inpairs,lookatthesepicturesanddiscusswhichonesarenaturalclonesandwhichonesareman-made.Thinkabouthowtheydiffer.;Dollythesheep;Shewasclonedwhiletheotherswerebornnaturally.Itisthecopyofanothersheep.;Whatcanyouseeinthepicture?;Whocutthestemofftheplant?;Whatdoyouknowabouttwins?;大家有疑问的，可以询问和交流;Therearetwinsofthesamesexandthoseofdifferentsexes.Thetwinshereareidenticalinsexandappearanceandaregoodexamplesofnaturalclones.Theycarrythesamegeneticinformation.Thefertilizedegghassplitintotwowhileinsidethemother,andsoproducedtwoidenticalhumanbabies.;Arethefollowingclonesthesame?Ifnot,whatisthedifference?;Theresttwoarenaturalclones.;Questionsaboutcloning:;2.Howisacloneproduced?;3.Whatbenefitscanhumansgainfromcloning?;4.Whatproblemsmayarisewhenhumansarecloned?;Thetextismainlyaboutthe1._________ofanimalcloningandthelifeofDollythesheep,aswellasthereasonswhycloningisstill2.___________.;Readthroughthepassageandfindthemainideaofeachparagraph.;Readthetextcarefullyandfillintheblanks.;;Choosethebestanswer.

AsforthecloningprocedureofDollythesheep,allofthefollowingaretrueEXCEPT_____.

A.thelambisthecloneofthedonatedcellfromsheepB

B.electricityisneeded

C.femalesheepBprovidesaneggcell

D.threefemalesheepareused;2.Fromthelastparagraphweknowthat _____.

A.cloningwillcometoanendbecauseof objections

B.clonedhumanbeingswillbeproduced inthenearfuture

C.manycountrieswillusecloningina wiseway

D.alltheresearchintohumancloning

willbeforbidden;A.Removethecellsnucleus.

B.Waituntiltheeggcellwithitsnewnucleusgrowsintoanembryo.;C.Removethenucleusfromafemale

sheep’seggcell.

D.Puttheembryointoanotherfemale

sheep.

E.Aclonedlambisproduced.

F.Ta