GRE入学测试题20Word格式.docx
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GRE入学测试题20Word格式.docx
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C.curtailing…warnedD.ignoring…transformed
E.slaking…increased
5.Thescientistfounditpuzzlingthathistheoryencountered_______despitewidespreadagreementthatitwas_______。
A.respect…crucialB.dismissal…simplistic
C.skepticism…unfathomableD.opposition…indisputable
E.acceptance…comprehensive
6.Theideasexpressedinthearthistorian’sbookaremore_____thanonewouldexpectorthebasisofherrather_________treatmentofhersubjectintheopeningpages.
A.compelling…intriguingB.accessible…recondite
C.hidebound…reactionaryD.insightful…innovative
E.dispassionate…evenhanded
7.Thehistoryoffilmreflectsthe_____inherentinthemediumitself:
filmcombinesstillphotographstorepresentcontinuousmotionand,whileseemingtopresentlifeitself,canalsoofferimpossibleanddreamlikeunrealities.
A.trivialitiesB.biasesC.constraints
D.paradoxesE.liabilities
8.Artthatenduresoftenmakesaninitiallydisturbingimpact:
theprofoundexperiencethatsuchartseekstoprovokenecessarilyengendersacertain________。
A.familiarityB.ennuiC.upheaval
D.intimacyE.tranquility
9.Recentresearchinlinguisticssuggeststhatsomelanguageskillsarenot_____skills,butarepasseddownthroughourgeneticcode.
(A)communicative(B)fluent(C)acquired
(D)hereditary.(E)challenging
10.The______withwhichthepoliticianpeppersherspeechesaresomemorablethatmanypeoplethinkofherasbeingfarmore_______thansheinfactis……
A.superlatives…egalitarianB.pejoratives…optimistic
C.examples…soporificD.diatribes…censorious
E.malapropisms…straightforward
二.阅读题(每题2分)
Aspeopleage,theircellsbecomelessefficientand
lessabletoreplacedamagedcomponents.Atthesame
timetheirtissuesstiffen.Forexample,thelungsandthe
heartmuscleexpandlesssuccessfully,thebloodvessels
(5)becomeincreasinglyrigid,andtheligamentsandtendons
tighten.
Fewinvestigatorswouldattributesuchdiverseeffects
toasinglecause.Nevertheless,researchershavediscov-
eredthataprocesslongknowntodiscolorandtoughen
(10)foodsmayalsocontributetoage-relatedimpairmentof
bothcellsandtissues.Thatprocessisnonenzymatic
glycosylation,wherebyglucosebecomesattachedtopro-
teinswithouttheaidofenzymes.Whenenzymesattach
glucosetoproteins(enzymaticglycosylation),theydoso
(15)ataspecificsiteonaspecificproteinmoleculefora
specificpurpose.Incontrast,thenonenzymaticprocess
addsglucosehaphazardlytoanyofseveralsitesalong
anyavailablepeptidechainwithinaproteinmolecule.
Thisnonenzymaticglycosylationofcertainproteins
(20)hasbeenunderstoodbyfoodchemistsfordecades,
althoughfewbiologistsrecognizeduntilrecentlythatthe
samestepscouldtakeplaceinthebody.Nonenzymatic
glycosylationbeginswhenanaldehydegroup(CHO)of
glucoseandanaminogroup(NH2)ofaproteinare
(25)attractedtoeachother.Themoleculescombine,forming
whatiscalledaSchiffbasewithintheprotein.Thiscom-
binationisunstableandquicklyrearrangesitselfintoa
stabler,butstillreversible,substanceknownasan
Amadoriproduct.
(30)Ifagivenproteinpersistsinthebodyformonthsor
years,someofitsAmadoriproductsslowlydehydrateand
rearrangethemselvesyetagain,intonewglucose-derived
structures.Thesecancombinewithvariouskindsofmol-
eculestoformirreversiblestructuresnamedadvanced
(35)glycosylationendproducts(AGE'
s).MostAGE'
sare
yellowishbrownandfluorescentandhavespecificspec-
trographicproperties.Moreimportantforthebody,many
arealsoabletocross-linkadjacentproteins,particularly
onesthatgivestructuretotissuesandorgans.Although
(40)noonehasyetsatisfactorilydescribedtheoriginofall
suchbridgesbetweenproteins,manyinvestigatorsagree
thatextensivecross-linkingofproteinsprobablycontrib-
utestothestiffeningandlossofelasticitycharacteristic
ofagingtissues.
(45)Inanattempttolinkthisprocesswiththedevelop-
mentofcataracts(thebrowningandcloudingofthelens
oftheeyeaspeopleage),researchersstudiedtheeffect
ofglucoseonsolutionsofpurifiedcrystallin,themajor
proteininthelensoftheeye.Glucose-freesolutions
(50)remainedclear,butsolutionswithglucosecausedthe
proteinstoformclusters,suggestingthatthemolecules
hadbecomecross-linked.Theclustersdiffractedlight,
makingthesolutionopaque.Theresearchersalso
discoveredthatthepigmentedcross-linksinhuman
(55)cataractshavethebrownishcolorandfluorescence
characteristicofAGE'
s.Thesedatasuggestthat
nonenzymaticglycosylationoflenscrystallinsmay
contributetocataractformation.
17.Withwhichofthefollowingstatementsconcerningthestiffeningofagingtissueswouldtheauthormostlikelyagree?
(A)Itiscausedtoalargedegreebyanincreasedrateofcellmultiplication.
(B)Itparadoxicallybothhelpsandhindersthelongevityofproteinsinthehumanbody.
(C)Itcanbecounteractedinpartbyincreasedingestionofglucose-freefoods.
(D)Itisexacerbatedbyincreasedenzymaticglycosylation.
(E)Itprobablyinvolvesthenonenzymaticglycosylationofproteins.
18.Accordingtothepassage,whichofthefollowingstatementsistrueoftheprocessthatdiscolorsandtoughensfoods?
(A)Ittakesplacemoreslowlythanglycosylationinthehumanbody.
(B)Itrequiresahigherratioofglucosetoproteinthanglycosylationrequiresinthehumanbody.
(C)Itdoesnotrequiretheaidofenzymestoattachglucosetoprotein.
(D)Itproceedsmorequicklywhenthefoodproteinshaveamolecularstructuresimilartothatofcrystallinproteins.
(E)Itseffectivenessdependsheavilyontheamountofenvironmentalmoisture.
19.Accordingtothepassage,whichofthefollowingischaracteristicofenzymaticglycosylationofproteins?
(A)AGE'
sareformedafteraperiodofmonthsoryears.
(B)Proteinsaffectedbytheprocessaremadeunstable.
(C)Glucoseattachmentimpairsandstiffenstissues.
(D)Glucoseisattachedtoproteinsforspecificpurposes.
(E)AminogroupscombinewithaldehydegroupstoformSchiffbases.
20.Accordingtothepassage,whichofthefollowingstatementsistrueofAmadoriproductsinproteins?
(A)Theyaremoreplentifulinadehydratedenvironment.
(B)Theyarecreatedthroughenzymaticglycosylation.
(C)Theyarecomposedentirelyofglucosemolecules.
(D)TheyarederivedfromSchiffbases.
(E)TheyarederivedfromAGE'
s
21.Whichofthefollowingbestdescribesthefunctionofthethirdparagraphofthepassage(lines19-29)?
(A)Itoffersevidencethatcontradictsthefindingsdescribedinthefirsttwoparagraphs.
(B)Itpresentsaspecificexampleoftheprocessdiscussedinthefirsttwoparagraphs.
(C)Itexplainsaproblemthattheresearchersmentionedinthesecondparagraphhaveyettosolve.
(D)Itevaluatestheresearchdiscoveriesdescribedinthepreviousparagraph.
(E)Itbeginsadetaileddescriptionoftheprocessintroducedintheprevioustwoparagraphs.
二.数学题(每题2分)
1.Arectangularparkinglot2xfeetlongandxfeetwideistobeenlargedsothatthelotwillbe2timesaslongand3timesaswideasitisnow.Theareaoftheenlargedrectangularlotwillbehowmanytimestheareaofthepresentlot?
(A)6
(B)5
(C)4
(D)3
(E)2
2.If2x=5and3y=8,then
=
(A)
(B)
(C)
(D)
(E)
Questions3-5refertothefollowinggraph.
3.Thetwocorporatesectorsthatincreasedtheirsupportfortheartsfrom1988to1991madeatotalcontributionin1991ofapproximatelyhowmanymilliondollars?
(A)112
(B)125
(C)200
(D)250
(E)315
4.Howmanyofthesixcorporatesectorslistedeachcontributedmorethan$60milliontotheartsinboth1988and1991?
(A)One
(B)Two
(C)three
(D)Four
(E)Five
5.Approximatelyhowmanymilliondollarsmoredidthewholesalesectorcontributetotheartsin1988thanin1991?
(A)10.4
(B)12.6
(C)14.0
(D)16.5
(E)19.2
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