GRE试题二(2)(在线收听) |
10.Aworldwidebanontheproductionofcertainozone-destroyingchemicalswouldprovideonlyanillusionofprotection.Quantitiesofsuchchemicals,alreadyproduced,existascoolantsinmillionsofrefrigerators.Whentheyreachtheozonelayerintheatmosphere,theiractioncannotbehalted.Sothereisnowaytopreventthesechemicalsfromdamagingtheozonelayerfurther. Whichofthefollowing,iftrue,mostseriouslyweakenstheargumentabove? (A)Itisimpossibletomeasurewithaccuracythequantityofozone-destroyingchemicalsthatexistascoolantsinrefrigerators.(B)Inmodernsocieties,refrigerationoffoodisnecessarytopreventunhealthyandpotentiallylife-threateningconditions.(C)Replacementchemicalsthatwillnotdestroyozonehavenotyetbeendevelopedandwouldbemoreexpensivethanthechemicalsnowusedascoolantsinrefrigerators.(D)Evenifpeopleshouldgiveuptheuseofrefrigeration,thecoolantsalreadyinexistingrefrigeratorsareathreattoatmosphericozone.(E)Thecoolantsinrefrigeratorcanbefullyrecoveredattheendoftheusefullifeoftherefrigeratorsandreused. Question11--15 Agovernmentisassigningeachofsixembassyofficeworkers--Farr,Golden,Hayakawa,Inserra,Jones,andKovacs--toembassies.Therearefourembassies.EmbassiesLandMarelocatedincountrieswithdryclimates,whereasembassiesPandTarelocatedincountrieswithhumidclimates.Theofficeworkersmustbeassignedaccordingtothefollowingrules: Eachembassymusthaveatleastoneoftheworkersassignedtoit.Atleastoneembassyinahumidclimatemusthaveatleasttwoworkersassigned toit.GoldencannotbeassignedtothesameembassyasKovacs.Inserramustbeassignedtanembassyinadryclimates.Jonesmustbeassignedtoanembassyinahumidclimate.11.Whichofthefollowingisanacceptableassignmentoftheworkerstotheembassies? LMPT(A)Farr,GoldenInserra,KovacsHayakawaJones(B)Golden,KovacsInserraJonesFarr,Hayakawa(C)GoldenFarr,InserraKovacsJones,Hayakawa(D)JonesGolden,InserraHayakawaFarr,Kovacs(E)KovacsFarr,HayakawaInserraGolden,Jones 12.WhichofthefollowingmustbeassignedeithertoembassyLortoembassyM? (A)Farr(B)Golden(C)Hayakawa(D)Inserra(E)Kovacs 13.WhichofthefollowingCANNOTbetrue? (A)OneworkerisassignedtoL.(B)TwoworkersisassignedtoP.(C)TwoworkersareassignedtoL.(D)ThreeworkersareassignedtoM.(E)ThreeworkersareassignedtoT. 14.IfGoldenandKovacsareassignedtoLandM,respectively,whichofthefollowingmustbetrue? (A)FarrisassignedtoeitherPorT.(B)InserraisassignedtoeitherPorT.(C)PandTeachhavetwoworkersassignedtothem.(D)HayakawaisassignedtoL.(E)HayakawaisassignedtoT. 15.IfGolden,Hayakawa,andKovacsareamongtheworkersassignedtoembassiesinhumidclimayes,whichofthefollowingmustbetrue? (A)Farrisassignedtoanembassytowhichnoneoftheotherfiveofficeworkersisassigned.(B)Goldenisassignedtoanembassytowhichnoneoftheotherfiveofficeworkersisassigned.(C)JonesisassignedtothesameembassyasGolden.(D)HayakawaisassignedtothesameembassyasGolden.(E)HayakawaisassignedtothesameembassyasKovacs. Question16--19 Avolunteerusesatrucktopickupdonationsofunsoldfoodandclothingfromstoresandtodeliverthemtolocationswheretheycanbedistributed.Hedrivesonlyalongacertainnetworkofroads. Inthenetworktherearetwo-wayroadsconnectingeachofthefollowingpairsofpoints:1with2,1with3,1with5,2with6,3with7,5with6,and6with7.Therearealsoone-wayroadsgoingfrom2to4,from3to2,andfrom4to3.Therearenootherroadsinthenetwork,andtheroadsinthenetworkdonotintersect. Tomakeatripinvolvingpickupsanddeliverirs,thevolunteeralwaystakesaroutethatforthewholetrippassesthroughthefewestofthepoints1through7,countingapointtwiceifthevolunteerpassesthroughittwice. Thevolunteer’shomeisatpoint3.Donationscanbepickedupatasupermarketatpoint1,aclothingstoreatpoint5,andabakeryatpoint4.Deliveriescanbemadeasneededtoatutoringcenteratpoint2,adistributioncenteratpoint6,andashelteratpoint7. 16.Ifthevolunteerstartsatthesupermarketandnextistogototheshelter,thefirstintermediatepointhisrputepassesthroughmustbe (A)2(B)3(C)5(D)6(E)7 17.If,startingfromhome,thevolunteernextistomakepickupsfortheshelteratthesupermarketandthebakery(ineitherorder),thefirsttwointermediatepointsonhisroute,beginningwiththefirst,mustbe (A)1and2(B)1and3(C)2and1(D)2and4(E)4and2 18.If,startingfromtheclothingstore,thevolunteernextistopickupbreadateitherthesupermarketorthebakery(whicheverstopmakeshisroutegothroughthefewestofthepoints)andthenistogototheshelter,thefirsttwopointshereachesaftertheclothingstore,beginningwiththefirst,mustbe (A)1and2(B)1and3(C)4and2(D)6and2(E)6and4 19.Ifthevolunteeristomakeatripstartingattheshelter,nextgoingtothebakeryforapickup,andthenendingatthedistributioncenter,thefirsttwointermediatepointsonhisroute,beginningwiththefirst,canbe (A)3and1(B)3and4(C)4and2(D)6and2(E)6and5 Question20--22 Adeveloperisplanningtobuildahousingcomplexonanemptytractofland.Exactlysevendifferentstylesofhouses--Q,R,S,T,W,X,andZ--willbebuildinthecomplex.Thecomplexwillcontainseveralblocks,andthedeveloperplanstoputhousesofatleastthreedifferentstylesoneachblock.Thedeveloperwillbuildthecomplexaccordingtothefollowingrules: AnyblockthathasstyleZonitmustalsohavestyleWonit. AnyblockadjacenttoonethathasonitbothstyleSandstyleXmusthaveonit styleTandstyleZ. NoblockadjacenttoonethathasonitbothstyleRandstyleZcanhaveonit eitherstyleTorstyleW. NoblockcanhaveonitbothstyleSandstyleQ. 20.Whichofthefollowingcanbethecompleteselectionofhousestyleonablock? (A)Q,R,S(B)Q,S,X(C)R,T,Z(D)S,W,Z(E)T,X,Z |
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