专业GMAT与托福保分机构
雷哥GMAT备考宝典之真题解析3【原创】
真题训练：
Whichofthefollowingmostlogicallycompletestheargumentbelow?DavisonRiverfarmersarecurrentlydecidingbetweenplantingwinterwheatthisfallorspringwheatnextspring.Winterwheatandspringwheatareusuallyaboutequallyprofitable.Becauseofnewgovernment
restrictionsontheuseofDavisonRiverwaterforirrigation,peracreyieldsforwinterwheat,thoughnotforspringwheat,wouldbemuchlowerthanaverage.Therefore,plantingspringwheatwillbemoreprofitablethanplantingwinterwheat,since.
(A)thesmaller-than-averagesizeofawinterwheatharvestthisyearwouldnotbecompensatedforbyhigherwinterwheatprices
(B)newcropsofspringwheatmustbeplantedearlierthanthetimeatwhichstandingcropsofwinterwheatarereadytobeharvested(C)thespringwheatthatfarmersintheDavisonRiverregionplantiswelladaptedtothesoiloftheregion
(D)springwheathasusesthataredifferentfromthoseofwinterwheat(E)plantingspringwheatismoreprofitablethanplantingcertainothercrops,suchasrye分析：
原文：对灌溉用水的--冬小麦每英亩产量减小---冬小麦和春小麦的选择
问题：春小麦利润高的理由。
解题关键：原文谈钱，选项谈钱更有关。选项：
A，冬小麦高价不能补偿冬小麦收获的减少；潜台词：冬小麦利润减少，小于春小麦。有关
B，春小麦的种植必须早于冬小麦的收割；种植时间，无关。C，春小麦更适合土壤；无关。
D，春小麦的作用与冬小麦不同，无关。E，种春小麦比其他庄稼利润高。无关比较。答案：A。真题训练2：
Whenthereislessrainfallthannormal,thewaterlevelofAustralianriversfallsandtheriversflowmoreslowly.Becausealgaewhosehabitatisriverwatergrowbestinslow-movingwater,theamountofalgaeperunitofwatergenerallyincreaseswhentherehasbeenlittlerain.By
专业GMAT与托福保分机构
contrast,however,followingaperiodofextremedrought,algaelevelsareloweveninveryslow-movingriverwater.
Whichofthefollowing,iftrue,doesmosttoexplainthecontrastdescribedabove?
(A)Duringperiodsofextremedrought,thepopulationsofsomeofthespeciesthatfeedonalgaetendtofall.
(B)Themoreslowlywatermoves,themoreconduciveitstemperatureistothegrowthofalgae.
(C)Whenalgaepopulationsreachveryhighlevels,conditionswithintherivercanbecometoxicforsomeoftheotherspeciesthatnormallylivethere.
(D)Australianriversdryupcompletelyforshortintervalsinperiodsofextremedrought.
(E)Exceptduringperiodsofextremedrought,algaelevelstendtobehigherinriversinwhichtheflowhasbeencontrolledbydammingthaninriversthatflowfreely.
原文：（雨量减少、流速较低、）严重干旱---algae生长问题：解释对比关系解题关键：选项：
A，干旱时，一些以algae为食的物种减少；无意义概率，反向；B，水流越慢，温度越适宜；无关；C，algae数量较高时，环境变得对其他物种有毒；无关D，极度干旱时河水短期枯竭；潜台词，无法生长，有关
E，除了干旱期，algae水平在水流受大坝控制的河里比在自由流动的河里较高；无关比较。答案：选D。责任编辑：Vicky