2013届高考英语一轮复习 专项提能计划 阅读理解课件（三） 外研版.ppt

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1、专项提能计划——阅读理解（三）科普类(2011·高考陕西卷·D)Eversincetheywerefirstputonthemarketintheearly1990s,geneticallymodified(GM,转基因)foodshavebeenincreasinglydevelopedandmarketedinmanycountriesintheworld，mainlyonthebasisoftheirpromisetoendtheworldwidefoodcrisis.ButcanGMtechnologysolveworldhungerproblems?Evenifi

2、twould，isitthebestsolution?Despitewhatitpromises，GMtechnologyactuallyhasnotincreasedtheproductionpotential(潜力)ofanycrop.Infact，studiesshowthatthemostwidelygrownGMcrop，GMsoybeans，hassufferedreducedproductivity.Forinstance，areportthatanalysednearlytwodecadesofresearchonmajorGMfoodcropsshowst

3、hatGMengineeringhasfailedtosignificantlyincreaseUScropproduction.Somethingelse，however，hasbeenontherise.WhileGMseedsareexpensive，GMcompaniestellfarmersthattheywillmakegoodprofitsbysavingmoneyonpesticides(杀虫剂)．Onthecontrary，USgovernmentdatashowthatGMcropsintheUShaveproducedanoverallincrease

4、inpesticideusecomparedtotraditionalcrops.“Thepromisewasthatyoucoulduselesschemicalsandboostproduction.Butneitheristrue,”saidBillChristison，PresidentoftheUSNationalFamilyFarmCoalition.Atthesametime，theauthorsofthebookWorldHunger：TwelveMythsarguethatthereactuallyismorethanenoughfoodintheworl

5、dandthatthehungercrisisisnotcausedbyproduction，butbyproblemsinfooddistributionandpolitics.Theseindeeddeserveoureffortsandmoney.Meanwhile，theriseinfoodpricesresultsfromtheincreaseduseofcropsforfuelratherthanfood，accordingtoa2008WorldBankreport.Asamatteroffact，scientistsseebetterwaystofeedth

6、eworld.AnotherWorldBankreportconcludedthatGMcropshavelittletooffertothechallengesofworldwidepovertyandhunger，becausebetterwaysoutareavailable，amongwhich“green”farmingissupposedtobethefirstchoice.57．Theauthordevelopsthesecondparagraphmainly________.A．byclassificationB．bycomparisonC．byexampl

7、eD．byprocess58．Whatdoestheunderlinedword“boost”inthethirdparagraphprobablymean?A．Control.B．Evaluate.C．Obtain.D．Increase.59．GMcompaniespromisefarmersthattheywillbenefitfrom________.A．practising“green”farmingB．useoflesschemicalsC．fairdistributionoftheircropsD．us