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InordertosolveaburglarythathastakenplaceattheMarshalls'house,DetectiveJohnsonhasbeeninstructedtosearchexactlysevenlocations—thefoyer,thekitchen,thelivingroom,theguestroom,thehallway,themusicroom,andthenursery.Thefoyer,kitchen,andlivingroomarelocateddownstairs,whereastheguestroom,hallway,musicroom,andnurseryarelocatedupstairs.Duringthefirstvisittosearchforevidence,DetectiveJohnsonhastimetosearchexactlythreelocations.Thissearchmustbeconductedaccordingtothefollowingconditions:Thethreelocationssearchedmustbeneitherallupstairsnoralldownstairs.Ifthehallwayissearched,thenthefoyermustalsobesearched.Ifthemusicroomisnotsearched,thentheguestroomcannotbesearched.Thekitchenandthelivingroomcannotbothbesearched.Thethreelocationssearchedmustincludethelivingroomorthenursery,orboth.WhichofthefollowingisaselectionoflocationsthatconformstotheconditionsforDetectiveJohnson'sfirstvisit?Foyer,guestroom,hallwayFoyer,hallway,livingroomFoyer,kitchen,livingroomGuestroom,hallway,kitchenGuestroom,musicroom,nursery————————————————————————答案：(B)Duringthefirstvisit,ifthekitchenissearched,whichofthefollowingmustalsobesearched?ThefoyerTheguestroomThehallwayThemusicroomThenursery————————————————————————答案：(E)Duringthefirstvisit,ifthemusicroomissearched,whichofthefollowingisapairoflocationsthatcanbothalsobesearched?ThefoyerandthehallwayTheguestroomandthekitchenThehallwayandthelivingroomThekitchenandthelivingroomThekitchenandthenursery————————————————————————答案：(E)Duringthefirstvisit,iftheguestroomissearched,whichofthefollowingmustalsobesearched?ThefoyerThehallwayThekitchenThelivingroomThenursery————————————————————————答案：(D)Duringthefirstvisit,ifthekitchenistheonlydownstairslocationsearched,whichofthefollowingmustalsobesearched?ThemusicroomandthenurseryThehallwayandthenurseryThehallwayandthemusicroomTheguestroomandthenurseryTheguestroomandthemusicroom————————————————————————答案：(A)Duringthefirstvisit,ifthelivingroomisnotsearched,whichofthefollowingisapairoflocationsthatcanbothbesearched?ThefoyerandtheguestroomThehallwayandthekitchenThefoyerandthemusicroomThehallwayandthemusicroomTheguestroomandthekitchen————————————————————————答案：(C)Thepresenceofmicroorganismsthatproduceatoxincausesseawatertoturnbrownishred,aphenomenonknownasaredtide.Seaottersdonotfeedinareaswhereclams,theirmainsourceoffood,havebecomecontaminatedwiththistoxin.Accordingtoaproposedexplanationoftheotters'behavior,theotterssampletheclamsinapotentialfeedingareaandcantasteanytoxininthem.Whichofthefollowing,iftrue,wouldmoststronglyindicatethatthehypothesisdescribedinthelastsentenceofthepassageisnotcorrect?Insomeoftheareaswhereredtidesoccur,neitherclamsnorseaottersareindigenousspecies.Thepresenceofseaottersinagivenareahasasignificanteffectonwhichothermarineorganismsaretobefoundinthatarea.Whenseawaterinanareaunaffectedbyredtideisartificiallydyedbrownishred,seaottersdonotfeedontheclamsinthatarea.Iftheclamsinagivenareaarecontaminatedwithtoxins,seaottersmovetootherareasinsearchoffood.Althoughverysmallamountsofthetoxinproducedduringaredtidearenotharmful,largedosescanbefataltoanimalsthesizeofseaotters.————————————————————————答案：(C)问题：下面哪一个，iftrue，最强烈地指出上文最后一句话所描述的假设是不正确的读题：产生一种毒质的微生物的存在引起海水变为褐红色，我们称之为红潮的现象。海濑不吃被毒素污染的clam,clam是它们的主要事物来源。按照海濑行为的某种解释,海濑抽样检查clam,并且能够尝出任何有毒物质分析：原文是一个现象:海濑不吃被毒素污染的clam一个解释:海濑抽样检查clam,并且能够尝出任何有毒物质问题是要反对，答案形式一般为：1、有其他的原因来解释上面这个现象C.在没有被红潮污染的海水人为地染成褐红色,海濑不吃那个区域的clam(恰恰说明海濑根据颜色来判断，而并不是抽样检查，尝出毒素，反对了原来的解释)D.如果某一区域中的clam被毒素污染了,seaotter移动到其它地方寻求食物(clam被污染，就不吃，与原文解释观点相同，作为SUPPORT)Anacreofaveragefarmlandproducesonlyabout400poundsofgrainamaranth,asagainst2,400poundsperacre,orsixtimesasmuch,forwheat.Itfollowsthatwheneverthegrain-amaranthpriceisprojectedtobemorethansixtimestheprojectedpriceofwheat,farmerswishingtomaximizeprofitswillgrowgrainamaranthratherthanwheat.Theargumentaboveisbasedonwhichofthefollowingassumptions?Anacre'sworthofgrainamaranthisnomoreexpensivetogrowandbringtomarketthananacre'sworthofwheat.Thereisnocropthatproducesahigheryieldintermsofpoundsharvestedperacrethanwheat.Bychoosingwhichcropstogrow,farmerscanexertasignificantinfluenceonthepricesofthosecrops.Farmersarenolessmotivatedbythedesiretomaximizeprofitsthanareotheroccupationalgroups.Pricesofgraincropscanchangefasterthanfarmerscanchangetheacreagedevotedtovariousgraincrops.————————————————————————答案：(A)问题：上文的论述基于下面哪一个ASSUMPTION?读题：一亩地平均只生产400磅的ga,比较起来每亩生产2400磅小麦.因此，当ga的价格预测大于小麦价格的六倍时，农民为获取更大的利益将种植ga而不是小麦分析：上文原因是：ga产量是小麦产量的1/6结论是：只有价格ga是小麦6倍的时候，才种植ga而不是小麦这是GRE中典型的数字推理，必须基于一个假设：没有其他的因素来影响找具有否定词的选项（A,B,D）A.种植和运输到市场,一亩ga不比一亩小麦贵(指出没有种植和运输的因素需要考虑)B.没有一种作物比小麦有更高的产量Mostroadrepairsrequiremoretimeandmoneythanisbudgeted,butlastsummer'snighttimerepairsofHighway93andsimilarroadsrequirednomoretimeormoneythanhadbeenbudgeted.Therefore,makingsummerrepairstomajorroadsatnightwouldsavebothtimeandmoney.Whichofthefollowing,iftrue,moststronglysupportstheconclusiondrawnabove?Thesmallernumberofcarsontheroadsatnightandmorecomfortablenighttimetemperaturesallowroadworkerstoworkmorequickly.Roadrepaircrewsthatworkatnightmarktheirworksitesw