GRE出国考试模拟试题20.docx
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GRE出国考试模拟试题20.docx
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GRE出国考试模拟试题20
GRE出国考试模拟试题20
GRE出国考试模拟试题20GRE出国考试模拟试题20section6
time30minutes
25questions
1.joyce:
threeyearsagothetrafficcommission
modifiedourtown'sbusiestintersectionfor
bettervisibility,acommendableefforttocut
downontrafficaccidentsthere.
gary:
overthepastthreeyearstherehavebeen
more,notfewer,trafficaccidentsperweekat
thatintersection,sothemodificationhas
increasedthelikelihoodofaccidentsthere
theanswertowhichofthefollowingquestions
wouldbemostusefulinevaluatinggary'sargument?
(a)whatproportionofthetown'sdriversinvolved
inaccidentsthatoccurredpriortothe
modificationsufferedpersonalinjuryintheir
accidents?
(b)howlong,onaverage,hadthemembersofthe
trafficcommissionheldtheirofficeswhenthe
modificationwasimplemented?
(c)doamajorityofthetown'sresidentsapproveof
thetrafficcommission'soverallperformance?
(d)whatmeasureshavenearbytownstakenwithin
thelastthreeyearsinordertoimprovevisibil-
ityatdangerousintersections?
(e)howhasthevolumeoftrafficatthetown's
busiestintersectionchangedoverthelastthree
years?
2.womenmakeupthemajorityofthepopulationinthe
country,andmanyoftheprescriptionswrittenby
doctorsfortranquilizersareforwomenpatients.the
testingofthesedrugsforefficacyandthecalibration
ofrecommendeddoses,however,wasdoneonlyon
men.noteventheanimalsusedtotesttoxicitywere
female.
thestatementsabove,iftrue,bestsupportwhichof
thefollowingasaconclusion?
(a)sometranquilizersaremoreappropriatelypre-
scribedforwomenthanformen.
(b)therehavebeennoreportsofnegativeside
effectsfromprescribedtranquilizersinwomen
(c)tranquilizersareprescribedforpatientsinsome
instanceswhendoctorsdonotfeelconfidentof
theirdiagnoses.
(d)thetoxicityofdrugstowomenislessthanthe
toxicityofthesamedrugstomen.
(e)whethertherecommendeddosagesoftranquil-
izersareoptimalforwomenisnotknown.
questions3-8
alandscapedesignerhasavailabletwotreeseachofeightdifferentspecies
linden,maple,pine,quince,redbud,spruce,tupelo,andwalnutfromwhich
aselectionmustbemadeforplantingattwodifferentlocations.forplanting
ateachlocation,thedesignerwillselectexactlyfourtrees,representingfour
differenttreespecies,accordingtothefollowingconditions:
ifquinceisplantedatlocation1,sprucecannotbeplantedatlocation2.
iflindenandquinceareplantedatlocation1,pinemustbeplanted
atlocation2.
ifpineisplantedatlocation2,quinceandtupelomustbeplanted
atlocation1.
sprucecannotbeplantedatlocation1unlesslindenandpineareplanted
atlocation2.
3.whichofthefollowingisanacceptableselectionofspeciestobeplanted
atthetwolocations?
location1location2
(a)linden,maple,pine,quincemaple,pine,tupelo,walnut
(b)linden,pine,quince,walnutlinden,maple,tupelo,walnut
(c)maple,quince,spruce,tupelomaple,pine,tupelo,walnut
(d)quince,spruce,tupelo,walnutlinden,maple,pine,tupelo
(e)quince,spruce,tupelo,walnutlinden,pine,quince,spruce
4.ifmaple,spruce,andtupeloareplantedatlocation1,
thenwhichofthefollowingmustbetheotherspecies
plantedatlocation1?
(a)quince
(b)redbud
(c)spruce
(d)tupelo
(e)walnut
5.ifmaple,redbud,andwalnutareplantedatlocation1,
thenanyofthefollowingspeciescanbeplantedat
location2except
(a)linden
(b)pine
(c)quince
(d)tupelo
(e)walnut
6.iflindenandquinceareplantedatlocation1,then
whichofthefollowingmustbetrue?
(a)quinceisplantedatlocation2.
(b)spruceisplantedatlocation2.
(c)pineisnotplantedatlocation1.
(d)spruceisnotplantedatlocation1.
(e)tupeloisplantedatlocation1.
7.ifeachoftheeightspeciesisselectedforplanting
andspruceisplantedatlocation2,thenwhichof
thefollowingmustalsobeplantedatlocation2?
(a)linden
(b)pine
(c)quince
(d)tupelo
(e)walnut
8.ifeachoftheeightspeciesmustbeselectedforplant-
ingandquinceandtupeloareplantedatlocation1,
thenwhichofthefollowingcanbetheothertwo
speciesplantedatlocation1?
(a)mapleandspruce
(b)mapleandwalnut
(c)pineandredbud
(d)pineandspruce
(e)redbudandwalnut
9.graywolveshavebeenabsentfromalargenational
parkfordecades.parkofficialswishtoreestablish
thewolveswithoutjeopardizinganyexistingspecies
ofwildlifethere.sincetheparkcontainsadequate
preyforthewolvesandsincethewolvesavoidclose
contactwithpeople,reintroducingthemwouldserve
theofficials'purposewithoutseriouslyjeopardizing
visitors'safety.
eachofthefollowing,iftrue,strengthensthe
argumentaboveexcept:
(a)theparkissolargethatwolveswillnotneedto
ventureintoareasfrequentedbypeople.
(b)rabiesisveryrareinwolves,andtherehave
beennoverifiedcasesofserioushumaninjuries
fromnonrabidwildwolvessincerecordshave
beenkept.
(c)ranchersintheregionneartheparkhave
expressedconcernthatgraywolves,ifreintro-
duced,wouldsometimespreyontheirlivestock.
(d)predationbygraywolvesonelkintheparkis
likelytoimprovethehealthandviabilityofthe
park'selkpopulationasawholebyreducing
malnutritionamongtheelk.
(e)wolvesdonotpreyonanimalsofanyendangered
speciesthatcurrentlyinhabitthepark.
10.osteoporosisisadiseasethatreducesbonemass,lead-
ingtofragilebonesthatbreakeasily.currenttreat-
mentsforosteoporosissuchasestrogenorcalcitonin
helppreventfurtherlossofbonebutdonotincrease
bonemass.sincefluorideisknowntoincreasebone
mass,administeringfluoridetoosteoporosispatients
wouldthereforehelpmaketheirboneslesssusceptible
tobreaking.
whichofthefollowing,iftrue,mostseriously
weakenstheargumentabove?
(a)mostpeoplewhosufferfromosteoporosisare
notawarethatadministrationoffluoridecan
increasebonemass.
(b)fluorideisaddedtodrinkingwaterinmany
locationsinordertostrengthentheteethof
peoplewhodrinkthewater.
(c)theriskofcontractingosteoporosisandother
degenerativebonediseasesislessenedbyexer-
ciseandanadequateintakeofcalcium.
(d)unlikeadministrationoffluoride,administration
ofestrogenorcalcitoninisknowntocause
undesirablesideeffectsformanypeople.
(e)thenewbonemassthatisaddedbytheadmin-
istrationoffluorideismorebrittleandless
elasticthannormalbonetissue.
11.theclosestdistancefromwhichanasteroidhasbeen
photographedusingground-basedradaris2.2million
miles,thedistancefromwhichtheasteroidtoutatis
wasrecentlyphotographed.theclosestphotographof
anasteroidisofgaspra,whichwasphotographed
fromadistanceofonly10,000miles.
whichofthefollowingcanbeproperlyconcluded
fromthestatementsabove?
(a)toutatisismorelikelytocollidewiththeearth
thangasprais.
(b)toutatis,unlikegaspra,hasonlyrecentlybeen
discovered.
(c)asteroidscanbephotographedonlybyusing
ground-basedradar.
(d)ground-basedradarphotographycannottake
photographsofobjectsmuchbeyond2.2million
milesfromearth.
(e)thephotographofgasprawasnottakenusing
ground-basedradar.
12.whichofthefollowingmostlogicallycompletesthe
argumentbelow?
aloneamonglivingspecies,humanbeingsexperience
adolescence,aperiodofacceleratedphysicalgrowth
priortofullmaturity.whetherotherhominidspecies,
whicharenowallextinctandareknownonlythrough
thefossilrecord,wentthroughadolescencecannotbe
known,since
(a)theminimumaccelerationinphysicalgrowth
thatwouldindicateadolescencemightdiffer
accordingtospecies
(b)thefossilrecord,thoughsteadilyexpanding,will
alwaysremainincomplete
(c)detectingtheadolescentgrowthspurtrequires
measurementsonthesameindividualatdiffer-
entages
(d)completeskeletonsofextincthominidsare
extremelyrare
(e)humanbeingsmightbethefirstspeciestobene-
fitfromthesurvivaladvantages,ifany,con-
ferredbyadolescence
questions13-17
acircusmagicianhasa"magicbox"thathasexactlysix
chambersdesignedtoholdatleasttwoanimalseach.there
arefivetrainedanimalsafrog,ahen,amouse,apara-
keet,andarabbit.onthefrontofthebox,chambers1,2,
and3arearrangedinastraightlinesothatchamber1is
directlyadjacenttochamber2,andchamber2isdirectly
adjacenttochamber3.onthebackofthebox,thecham-
bersarealsoarrangedinastraightlinewithchamber4
directlyadjacenttochamber5,andchamber5directly
adjacenttochamber6.nochamberinthefrontofthe
boxisdirectlyadjacenttoachamberintheback.
whenworkingwiththeanimals,themagicianmustobey
thefollowingrestrictions:
noneofthechamberscancontainmorethantwo
animalsatthesametime.
themousecannotbeinthesamechamberasany
otheranimal,andanychamberdirectlyadjacentto
thechamberthatthemouseoccupiesmustremain
empty.
neitherthehennorthefrogcanbeinthesame
chamberastheparakeet.
13.ifthemouseisinchamber2,andtheotherfour
animalsareallinchambers,whichofthefollowingis
apairofchambersthatmustbeempty?
(a)1and3
(b)1and4
(c)2and4
(d)3and5
(e)3and6
14.ifthemouseinchamber2,theparakeetisin
chamber4,andalltheotheranimalsareinchambers,
thenthehencanbeinchamber.
(a)1
(b)2
(c)
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