2024高考英语一轮复习Unit2单元主题语篇训练含解析新人教版选修8.doc

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Unit2单元主题语篇训练

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Withonlyabout1,000pandasleftintheworld,Chinaisdesperatelytryingtoclonetheanimalandsavetheendangeredspecies.ThatsamovesimilartowhataTexasAMUniversityresearchershavebeenundertakingforthepastfiveyearsinaprojectcalled“NoahsArk”．

NoahsArkisaimedatcollectingeggs,embryos(胚胎),semenandDNAofendangeredanimalsandstoringtheminliquidnitrogen.Ifcertainspeciesshouldbecomeextinct,Dr.DuaneKraemer,aprofessorinTexasAMsCollegeof

Itisestimatedthatasmanyas2,000speciesofmammals,birdsandreptileswillbecomeextinctinover100years.Thepanda,nativeonlytoChina,isindangerofbecomingextinctinthenext25years.

Thisweek,ChinesescientistssaidtheygrewanembryobyintroducingcellsfromadeadfemalepandaintotheeggcellsofaJapanesewhiterabbit.Theyarenowtryingtoimplanttheembryointoahostanimal.Theentireprocedurecouldtakefromthreetofiveyearstocomplete.

“Thenucleartransfer(核子移植)ofonespeciestoanotherisnoteasy,andthelackofavailable(capableofbeingused)pandaeggscouldbeamajorproblem，”Kraemerbelieves.“Theywillprobablyhavetodoseveralhundredtransferstoresultinonepregnancy(havingababy).Ittakesalongtimeanditsdifficult,butthiscouldbegroundbreakingscienceifitworks.Theyarecertainlynotputtinganylivepandasatrisk,soitisworththeeffort，”addsKraemer,whoisoneoftheleadersoftheProjectatTexasAM,thefirst-everattemptatcloningadog.

“Theyaretryingtodosomethingthatsneverbeendone,andthisisverysimilartoourworkinNoahsArk.Werebothtryingtosaveanimalsthatfaceextinction.Icertainlyappreciatetheireffortandtheresalotwecanlearnfromwhattheyareattemptingtodo.Itsaresearchthatisverymuchneeded.”

语篇解读：本文是一篇说明文。文章主要讲解并描述NoahsArk探究克隆熊猫的可能性。

1．Whatisthegoalof“NoahsArk”project?

A．Tosaveendangeredanimals