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1、科普知识类第一部分七年高考题荟萃2011年高考题1.（2011·陕西卷）DEversincetheywerefirstputonthemarketintheearly1990s,genticallymondified(GM,转基因)foodshavebeenincreasinglydevelopedandmarketedinmanycountriesintheword,mainlyonthebasisoftheirpromisetoendtheworldwidefoodcrisis.ButcanGMtechnologysolveworldhungerproblems?Evenifitwould
2、,isitthebestsolutiorr?Despitewhatitpromiises,GMtechnologyactuallyhasnotincreasedtheproductionpotentialofanycorp.InfactStudiesshowthatthemostcrownGMcroo.GMsoybeans,hassufferedreducedproductivity.Forinstance,areportthananalysednearlytwodecadesofresearchonmojorGMfoodcropsshowsthatGMengineeringhasfailed
3、tosignificantlyincreaseUScropproduction.Somethingelse,however,hasbeenontherise,WhileGMseedsareexpensive,GMcompanicstellfarmersthattheywillmakegoodprofitsbysavingmoneyonpesticides（杀虫剂）.Onthecontrary,USgovernmentdatashowthatGMcropsintheUShaveproducedanoverallincreaseinpesticideusecomparedtotraditional
4、crops.“Thepromisewasthatyoucoulduselesschemicalsandboostproduction.Butnetheristrue,”saidBillChristison,PresidentoftheUSNationalFarmCoalition.Atthesametime,theauthorsofthebookWorldHunger:TwelveMythsarguethatthereactuallyismorethanenoughfoodintheworldandthatthehungercrisisisnotcausedbyproduction,butby
5、problemsinfooddistributionandpolitics.Theseindeeddeserveoureffortsandmoney.Meanwhile,theriseinfoodpricesresultsfromtheincreaseduseofcropsforfuelratherthanfood,accordingtoa2008WorldBankreport.Asamatteroffact,scientistsseebetterwaystofeedtheworld.AnotherWorldBankreportconcludedthatGMcropshavelittletoo
6、ffertothechallengesofworldwidepovertyandhunger,becausebetterwaysoutareavailable,amongwhich“green”farmingissupposedtobethefirstchoice.57.Theauthordevelopsthesecondparagraphmainly.【C】A.byclassificationB.bycomparisonC.byexampleD.byprocess58.Whatdoestheunderlinedword“boost”inthethirdparagraphprobablymea
7、n?【D】A.Control.B.EvaluateC.Obtain.D.Increase.59.GMcompaniespromisefarmersthattheywillbenefitfrom______________.【B】A.practicing“green”farmingB.useoflesschemicalsC.fairdistributionoftheircropsD.usingmor
