英語教學(xué)課件：Unit 2 Cloning

Unit2Cloningisonethatoccursinnature.

Anaturalclone

isonethatisproducedthroughhumanintervention.(人類介入）Aman-madecloneDollythesheepShewas

while

theotherswereborn

.HowdoesDollydifferfromothersheep?man-madecloneclonednaturallyFirst-reading

Thepassagetellsusthatanimalcloningraisedandscientistsarenotsureaboutits.argumentsfutureWhat’sthewritingstyle?Expositive(說明性的)Argumentative（議論性的）Narrative（敘事性的）Descriptive（描寫性的）★What’sthemainideaofthepassage?2.Matcheachparagraphwiththeirtopicsentence.

Para1Para2Para3Para4Para5②Whatiscloning?③Twomajorusesofcloning

①Dolly’sproblemanddeath

④ArgumentsbroughtbyDolly

⑤TheeffectofDolly

3.Iscloningplantsthesamewithcloninganimals?

A.Yes,theyarethesamewitheachother.B.No,cloningplantsisstraightforwardbutcloninganimalsismorecomplicated.

CarefulreadingCloninghappensbothin______andin_______.(1分)Theycanbeclonedby________and_______.(1分)plantsanimalsthemselveshumansNaturalcloneMan-madeclonePara1

Thedefinitionofcloning2.Whatiscloning?(1分)Cloningisawayofmakinganexactcopyofanotheranimalorplant.3.Arethefollowingclonesthesame?（1分）Ifnot,whatisthedifference?NO.Thefirstoneisman-madeclone,whiletheresttwoarenaturalclones.Writetheletter“T”ifthestatementistrue.Write“F”ifitisfalse.(1分)1.Gardenerscanmakealotofmoneybycloningplants.2.Cloninganimalsisascomplicatedascloningplants.FTPara23.Dollythesheepwasthefirstsuccessfulcloneofamammal.4.Naturalcloneshappeninanimalsaswellasinplants.TTp_____________________________Procedure?(3)provideremovetakeoutjoingrow_____putEggcellNucleusSomaticcellEmbryocarrierThelambisthecloneofthecellfromsheepBbecause.(1分)A.itprovidestheeggcell

B.itgivesbirthtothelamb

C.itprovidesthenucleus

D.itisafemalesheepPara2Help?Harm?Group1Group2Advantages(3)Disadvantages(4)Para3-5AdvantagesItopenedeveryone’seyestothepossibilitytocureseriousillnesses.Gardenersuseitallthetimetoproducecommercialquantities

ofplants.Itisvaluableforresearchonnewplantspecies

andmedicalresearchonanimals.DisadvantagesDollylivedhalfthelengthoftheoriginalsheep.Evilleadersmaygetthemselvesclonedtoattaintheirambitions.Religiousleadersraisedmoralquestions.ScientistswerecastdowntofindthatDolly’sillnessesweremoreappropriatetoanolderanimal.Dollylivedsixandahalfyears,halfthelengthoftheoriginalsheep.Dolly’sillnessesweremoreappropriatetoamucholderanimal.Itcanbeinferredfromthetwosentencesthataclonedanimal_______.A.candevelopnormallyandwillliveaslongastheoriginaloneB.usuallyliveslongerthantheoriginaloneC.mayfallillyoungeranddieearlierthantheoriginaloneD.willhavenohealthyproblemsasDollythesheepWhat’stheauthor’sviewofpointinthereadingpassage?Doeshetelluswherecloningisleadingus?A.FavorableB.DisapprovalC.ObjectiveD.HopefulbasedonfactsDiscussionSupposethatyourparentswantedtohaveanotherbaby.Theyrealizethattheycannothaveasecondchild,sotheydecidetohaveaclonemadeofyou.Thinkofthesequestionsanddiscusswithyourpartners.Howwouldyoufeelabouthavingacloneofyourselfinthefamily?expressionsbeidenticalincommercialquantitiesofplantspayoffcastdownbeappropriatetoarbitraryfatehav