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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.ButcanGMtechnologysolveworldhungerprob
2、lems?Evenifitwould,isitthebestsolutiorr?Despitewhatitpromiises,GMtechnologyactuallyhasnotincreasedtheproductionpotentialofanycorp.InfactStudiesshowthatthemostcrownGMcroo.GMsoybeans,hassufferedreducedproductivity.Forinstance,areportthananalysednearlytwodecadesofresearchonmojorGMfood
3、cropsshowsthatGMengineeringhasfailedtosignificantlyincreaseUScropproduction.Somethingelse,however,hasbeenontherise,WhileGMseedsareexpensive,GMcompanicstellfarmersthattheywillmakegoodprofitsbysavingmoneyonpesticides（杀虫剂）.Onthecontrary,USgovernmentdatashowthatGMcropsintheUShaveproduc
4、edanoverallincreaseinpesticideusecomparedtotraditionalcrops.“Thepromisewasthatyoucoulduselesschemicalsandboostproduction.Butnetheristrue,”saidBillChristison,PresidentoftheUSNationalFarmCoalition.Atthesametime,theauthorsofthebookWorldHunger:TwelveMythsarguethatthereactuallyismoretha
5、nenoughfoodintheworldandthatthehungercrisisisnotcausedbyproduction,butbyproblemsinfooddistributionandpolitics.Theseindeeddeserveoureffortsandmoney.Meanwhile,theriseinfoodpricesresultsfromtheincreaseduseofcropsforfuelratherthanfood,accordingtoa2008WorldBankreport.Asamatteroffact,sci
6、entistsseebetterwaystofeedtheworld.AnotherWorldBankreportconcludedthatGMcropshavelittletooffertothechallengesofworldwidepovertyandhunger,becausebetterwaysoutareavailable,amongwhich“green”farmingissupposedtobethefirstchoice.57.Theauthordevelopsthesecondparagraphmainly.【C】A.byclassif
7、icationB.bycomparisonC.byexampleD.byprocess58.Whatdoestheunderlinedword“boost”inthethirdparagraphprobablymean?【D】A.Control.B.EvaluateC.Obtain.D.Increase.59.GMcompaniespromisefarmersthattheywillbenefitfrom______________.【B】A.practicing“green”farmingB.useoflesschemicalsC.fairdistribu
8、tionoftheircropsD.usingmor
