2017考研英语阅读理解考前冲刺试题第十一套

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相关推荐：>>>2017年考研现场确认时间及地点汇总>>>全国各地2017年考研报考点汇总>>>2017年考研时间、研究生考试时间安排&g

相关推荐：>>>2017年考研现场确认时间及地点汇总>>>全国各地2017年考研报考点汇总>>>2017年考研时间、研究生考试时间安排&g

相关推荐：>>>2017年考研现场确认时间及地点汇总>>>全国各地2017年考研报考点汇总>>>2017年考研时间、研究生考试时间安排>>>2017年考研大纲下载及解析汇总>>>2017年全国硕士研究生招生简章专题新东方网校推荐：2017年考研政治、英语、数学课程！！点击进入免费试听>>Dependingonwhomyouask，theexperimentannouncedataTexasmedicalconferencelastweekwasapotentialbreakthroughforinfertilewomen，atragicfailureoradangerousstepclosertothenightmarescenarioofhumancloning.There'struthtoallthesepointsofview.InfertilitywasclearlythemotivationwhenChinesedoctorsusedanewtechniquetohelponeoftheircountrywomengetpregnant.Unlikesomeinfertilewomen，the30-year-oldpatientprocedeggsjustfine，andthoseeggscouldbefertilizedbysperm.Buttheyneverdevelopedproperly，largelybecauseofdefectsinpartsoftheeggoutsidethefertilizednucleus.SousingatechniquedevelopedbyDr.JamesGrifoatNewYorkUniversity，Dr.ZhuangGuanglunofSunYat-senUniversityinGuangzhoutookthepatient'sfertilizedegg，scoopedoutthechromosome-bearingnuclearmaterialandputitinadonatedeggwhosenucleushadbeenremoved.Inthismorebenignenvironment，developmentproceedednormally，andthewomanbecamepregnantwithtripletswhocarriedamixofherDNAandherhusband's——prettymuchlikeanynormalbaby.Whathassomedoctorsandethicistsupsetisthatthisso-callednuclear-transfertechniquehasalsobeenusedtoproceclones，startingwithDollythesheep.Theonlysignificantdifferenceisthatwithcloning，theinsertednucleuscomesfromasingle，usuallyalt，cell，andtheresultingoffspringisgeneticallyidenticaltotheparent.Doingthatwithhumansisethicallyrepugnanttomany.Besides，forreasonsthataren'tyetwellunderstood，clonedanimalsoftenabortspontaneouslyorarebornwithdefects;Dollydiedveryyoung，thoughshehadseemedhealthy.AndbecausetheChinesewoman'stwinswerebornprematurelyanddied(thethirdtripletwasremovedearlyontoimprovechancesfortheremainingtwo)，criticshavesuggestedthatcloningandnucleartransferareequallyriskyforhumans.Notlikely，saysGrifo.“Theobstetricoutcomewasadisaster，”headmits，“buttheembryoswerechromosomallynormal.Wehavenoevidencethatithadanythingtodowiththeprocere.”Evenso，concernoverpotentialrisksiswhytheFoodandDrugAdministrationcreatedastringentapprovalprocessforsuchresearchin2001——aprocessthatGrifofoundsoonerousthathestoppedworkingonthetechniqueandgaveittotheresearchersinChina，whereitwassubsequentlybanned(butonlythismonth，longafterZhuang'spatientbecamepregnant)。Thebottomline，saycritics，isthatperfectingatechniquethatcouldbeusedforhumancloning，evenifitweredevelopedforanotherpurpose，isjustabadidea——anassertionZhuangrejects.“Iagreethatitmakessensetocontroltheseexperiments，”hesays.“Butwe'vedevelopedaneffectivetechnologytohelppeople.Weunderstandhowtodoit.Weneedit.”注(1)：本文选自Time;10/27/2003，p47;注(2)：本文习题命题模仿对象2003年真题Text4;1.Whatisimpliedinthefirstparagraph?[A]Somepeopleregarditasatragicfailure.[B]Thenewexperimentmeansabreakthroughforsomepeople.[C]Peoplehavedifferentreactionstothenewexperiment.[D]Thenewexperimentmeansastepfurthertothedangeroushumancloning.2.TheauthorusesthecaseofDollyandtheChinesepregnantwomantoshowthat_________.[A]bothnuclear-transferandcloningaredangerousforhumansandanimals[B]bothofthembenefitfromthenewtechnique[C]bothofthemaretheexamplesoftechnicalfailure[D]bothofthemarethefruitsofthenewtechnology3.Zhuang‘sattitudetowardthecritics’conclusionisoneof__________.[A]reservedconsent[B]strongdisapproval[C]slightcontempt[D]enthusiasticsupport4.Theonlydifferenceexistingbetweennuclear-transferandcloningtechniqueis________.[A]whetheritisusedforresearchorforhelpingtheinfertile[B]whethertheoffspringlooksliketheparent[C]whetheritisusedinanimalsorhumanbeings[D]whethertheinsertednucleuscomesfromasingleandusuallyaltcell5.Thetextintendstoexpresstheideathat_________.[A]researchofcloninghaspotentialrisks[B]theresearchofcloningshouldbestoppedtotally[C]ethicsandresearchofcloningareincontradiction[D]researchersshouldhavetherighttocontinuethestudyofcloning答案：CABDC

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相关推荐：>>>2017年考研现场确认时间及地点汇总>>>全国各地2017年考研报考点汇总>>>2017年考研时间、研究生考试时间安排&g