2012届高考英语 实战演练专题阅读理解（81-85）.doc

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1、2012届高考英语实战演练专题阅读理解（81-85）《附详析》(第81篇)Bananasareoneoftheworld’smostimportantfoodcrops.Theyarealsooneofthemostvaluableexports.Bananasdonotgrowfromseeds.Instead,theygrowfromexistingplants.Bananasarethreatenedbydiseasebecausealltheplantsonafarmarecopiesofeachother.Theyallsharethesamegenetic

2、weaknesses.Forexample,theCavendishbananaismostpopularinNorthAmericanandEuropeanmarkets.However，somekindsoffungusorganismseasilyinfecttheCavendish.BlackSigatokadiseaseaffectstheleavesofCavendishbananaplants.Thediseaseiscontrolledonlargefarmsbyputtingchemicalsontheplant’sleaves.Farmersput

3、anti-fungalchemicalsontheircropsuptoonceaweek.Anotherfungaldiseaseismoreserious.Panamadiseaseattackstherootsofthebananaplant.Thereisnochemicaltreatmentforthisdisease.Infectedplantsmustbedestroyed.PanamadiseasehasaffectedcropsinSoutheastAsia,AustraliaandSouthAfrica.Thereisconcernthatitma

4、yspreadtobananasgrownintheAmericas.ThiscouldthreatenanimportantexportproductforCentralandSouthAmerica.TheInternationalNetworkfortheImprovementofBananaandPlantainsupportsresearchonbananas.ThegrouphasheadquartersinFranceandotherofficesinthemajorbanana-growingareasoftheworld.Thegroupsaysth

5、atmoreresearchmustbedonetodevelopimprovedkindsofbananas.Thegroupsaysthatfungaldiseasesmainlyaffectonlyonekindofbanana.Infact,therearefivehundreddifferentkindsofbananas.FoodandAgricultureOrganizationoftheUnitedNationshassaidthattheCavendishbananarepresentsonly10%ofworldproduction.TheU．N.

6、agencysaysfarmersshouldgrowdifferentkindsofbananas.Thisprotectsagainstdiseasesthataffectonlyonekind.ExpertswarnthatdiseasemaycausetheCavendishbananatodisappear.Thishappenedearliertoanotherpopularbananabecauseofitsgeneticweaknessagainstdisease.[语篇解读]　香蕉由于遗传性的抗病弱点，在不久的将来有的品种可能会消失。文章列举了两种威

7、胁Cavendish香蕉的真菌病，国际组织建议农民种植更多种类的香蕉。1．Whatdoesthispassagemainlytellus?A.Bananasaretheworld’smostimportantfoodcrops.11用心爱心专心B.Therisktoapopularbananashowsneedtogrowotherkinds.C.Therearefivehundreddifferentkindsofbananas.D.Howtogrowbananasindifferentcountries.[解析]　主旨大意题。根据全文内容和结构判