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>>>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>>Awidelyheraldedbutstillexperimentalcancer-fightingcompoundmaybeusedsomedaytopreventtwoothermajorkillersofAmericans：heartdiseaseandstroke.ThatwastheimplicationofaremarkablereportpublishedlastweekinthejournalCirculationbyateamofresearchersfromDr.JudahFolkman'slaboratoryattheChildren'sHospitalinBoston.Theversatilecompoundisendostatin，ahumanproteinthatinhibitsangiogenesis，thegrowthofnewbloodvesselsinthebody.Intestsreportedin1997byFolkman，aprominentcancerresearcherwhopioneeredthestudyofangiogenesis，thedrughadrecedandeveneradicatedtumorsinlaboratorymice.How?Bystuntingthegrowthofcapillariesnecessaryfornourishingtheburgeoningmousetumors.WhennewsofFolkman'sachievementbecamewidelyknownlastyear，itledtowildlyexaggeratedpredictionsofimminentcancercures.Whenotherscientistswereinitiallyunabletoplicatethoseresults，questionsaroseaboutthevalidityofFolkman'sresearch.TheninFebruaryscientistsattheNationalCancerInstitute，withguidancefromFolkman，finallymatchedhisresults.Reassured，theN.C.I.gavethego-aheadforclinicaltrialsofendostatinlaterthisyearonpatientswithadvancedtumors.Howcanadrugthatisapparentlyeffectiveagainsttumorsalsorecetheriskofheartattackandstroke?Theanswerliesinthecompositionofplaque，thefattydepositthatbuildsupinarteriesandcaneventuallyclogthem.Plaqueconsistsofamixofcholesterol，whitebloodcellsandsmoothmusclecells，andasitaccumulates，anetworkofcapillariessproutsfromthearterywallstonourishthecells.Couldendostatinhaltthegrowthofcapillariesandstarvetheplaque?AFolkmanlabteamledbyDr.KarenMoultondecidedtofindout.Thescientistsputbabylabmiceona16-week“Westerndiet”thatwashighinfatandcholesterol，thenmeasuredtheplaquebuilponthewallsofeachaorta，thelargearterythatcarriesbloodfromthehearttotherestofthebody.Meanwhile，theyinjectedonegroupofmicewithendostatin，anotherwithadifferentblood-vesselinhibitorcalledTNP-470andacontrolgroupwithaninertsalinesolution.Twentyweekslatertheresearchersagainmeasuredplaqueinthemouseaortas.Theresultswerestartling：theendostatingroupaveraged85%lessplaquebuilpandtheTNP-470group70%lessthanthoseinthecontrolgroup.AlltooawareoftheprematurehopesraisedlastyearafterFolkman'stumorreport，theresearchershavebeencarefulnottooversellthenewresults.“Ifthisfindingissupportedinfuturestudies，”saysMoulton，“[itcouldopenthewayfor]treatmentsthatcoulddelaytheprogressionofheartdiseaseandpossiblyrecetheincidenceofheartattacksandstrokes.”Butanysuchtreatments，shestresses，areprobablyfiveto10yearsaway.注(1)：本文选自Time;04/19/99，p48;注(2)：本文习题命题模仿对象2004年真题Text1;1.Whatdidthereportindicate?[A]Averyimportantdrugisnowatexperimentalstage.[B]HeartdiseaseandstrokearethemostseriousthreatstoAmericans.[C]Thetumordrugcanbeusedfortheheartdiseaseinthefuture.[D]ManyAmericanssufferfromheartdiseaseandstroke.2.WhydidtheN.C.I.agreetohaveclinicaltrialsofendostatinonthepatients?[A]TheywereconvincedoftheFolkman'sresearch.[B]TheycandosucharesearchaswellasFolkman.[C]Thepatientswithadvancedtumorsneedthedrug.[D]Thedrugshouldbeprovedeffectiveonhumans.3.Theexpression“stuntingthegrowthofcapillaries”(Line8，Paragraph2)mostprobablymeans_______.[A]helpthegrowthofcapillaries[B]limitthegrowthofcapillaries[C]improvethegrowthofcapillaries[D]preventthegrowthofcapillaries4.Whycanthetumordrugbeusedfortheheart?[A]Itcanaccumulateanetworkofcapillariesandnourishthecells.[B]Itcanstopthegrowthofcapillariesandprovidenonourishmentforplaque.[C]Thecuringmethodoftumorandheartdiseaseisthesame.[D]Thetumorandheartdiseasearemadeupofthesamesubstance.5.Whichofthefollowingistrueaccordingtothetext?[A]Folkman'stumorreporthadbeenexaggerated.[B]Thetumordrugisnotaseffectiveaswhathasbeenexpected.[C]Thenewresultsoftheresearcharefarmoreencouraging.[D]Researchersstillhavealongwaytogotomakeanothersuccessfulexperiment.答案：CADBC

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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

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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