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1、2011高考英语阅读理解分类汇编之科普知识类1.（2011·陕西卷）DEversincetheywerefirstputonthemarketintheearly1990s,genticallymondified(GM,转基因)foodshavebeenincreasinglydevelopedandmarketedinmanycountriesintheword,mainlyonthebasisoftheirpromisetoendtheworldwidefoodcrisis.ButcanGMtech
2、nologysolveworldhungerproblems?Evenifitwould,isitthebestsolutiorr?Despitewhatitpromiises,GMtechnologyactuallyhasnotincreasedtheproductionpotentialofanycorp.InfactStudiesshowthatthemostcrownGMcroo.GMsoybeans,hassufferedreducedproductivity.Forinstance,arep
3、ortthananalysednearlytwodecadesofresearchonmojorGMfoodcropsshowsthatGMengineeringhasfailedtosignificantlyincreaseUScropproduction.Somethingelse,however,hasbeenontherise,WhileGMseedsareexpensive,GMcompanicstellfarmersthattheywillmakegoodprofitsbysavingmon
4、eyonpesticides（杀虫剂）.Onthecontrary,USgovernmentdatashowthatGMcropsintheUShaveproducedanoverallincreaseinpesticideusecomparedtotraditionalcrops.“Thepromisewasthatyoucoulduselesschemicalsandboostproduction.Butnetheristrue,”saidBillChristison,PresidentoftheU
5、SNationalFarmCoalition.Atthesametime,theauthorsofthebookWorldHunger:TwelveMythsarguethatthereactuallyismorethanenoughfoodintheworldandthatthehungercrisisisnotcausedbyproduction,butbyproblemsinfooddistributionandpolitics.Theseindeeddeserveoureffortsandmon
6、ey.Meanwhile,theriseinfoodpricesresultsfromtheincreaseduseofcropsforfuelratherthanfood,accordingtoa2008WorldBankreport.Asamatteroffact,scientistsseebetterwaystofeedtheworld.AnotherWorldBankreportconcludedthatGMcropshavelittletooffertothechallengesofworld
7、widepovertyandhunger,becausebetterwaysoutareavailable,amongwhich“green”farmingissupposedtobethefirstchoice.57.Theauthordevelopsthesecondparagraphmainly.【C】A.byclassificationB.bycomparisonC.byexampleD.byprocess58.Whatdoestheunderlinedword“boost”inthethird
8、paragraphprobablymean?【D】A.Control.B.EvaluateC.Obtain.D.Increase.59.GMcompaniespromisefarmersthattheywillbenefitfrom______________.【B】A.practicing“green”farmingB.useoflesschemicalsC.fairdistributionoftheircropsD.usingmorec
