高考英语二轮复习阅读理解专题测试题(34)

高考英语阅读理解二轮专题训练精品题（16）及答案阅读理解-----BWith only about 1,000 pandas left in the world, China is desperate

高考英语阅读理解二轮专题训练精品题（16）及答案 阅读理解-----B Withonlyabout1,000pandasleftintheworld,Chinaisdesperatelytrying toclonetheanimalandsavetheseinadangeroussituation.That'samove similartowhataTexasA&MUniversityresearchershavebeenundertakingfor thepastfiveyearsinaprojectcalled"Noah'sArk". Noah'sArkisaimedatcollectingeggs,embryos(胚胎),semenandDNAof theseanimalsandstoringtheminliquidnitrogen.Ifcertainspeciesshould becomeextinct,Dr.DuaneKraemer,aprofessorinTexasA&M'sCollegeof Veterinary,Medicine,saystherewouldbeenoughofthebasicbuildingblocks toreintroducethespeciesinthefuture. Itisestimatedthatasmanyas2,000speciesofmammals,birdsand reptileswillprobablybecomeextinctinover100years.Thepanda,nativeonly toChina,isindangerofbecomingextinctinthenext25years. Thisweek,Chinesescientistssaidtheygrewanembryobyintroducingcells fromadeadfemalepandaintotheeggcellsofaJapanesewhiterabbit.They arenowtryingtoimplanttheembryointoahostanimal. Theentireprocedurecouldtakefromthreetofiveyearstocomplete. "Thenucleartransferofonespeciestoanotherisnoteasy,butthelack ofavailablepandaeggscouldbeamajorproblem,"Kraemerbelieves."Theywill probablyhavetodoseveralhundredtransferstoresultinonepregnancy (havingababy).Ittakesalongtimeandit'sdifficult,butthiscouldbe groundbreakingscienceifitworks.Theyarecertainlynotputtinganylive pandasatrisk,soitisworththeeffort,"addsKraemer,whoisoneofthe leadersoftheProjectatTexasA&M,thefirst-everattemptatcloningadog. "Theyaretryingtodosomethingthat'sneverbeendone,andthisisvery similartoourworkinNoah'sArk.We'rebothtryingtosaveanimalsthatface extinction.Icertainlyappreciatetheireffortandthere'salotwecanlearn 1