[考试宝典]2011职称英语理工ab级阅读理解精讲.doc

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1、职称英语考试宝典系列软件职称英语理工AB级阅读理解精讲(1)　WhereHaveAlltheBeesGone?　　Scientistswhostudyinsectshavearealmysteryontheirhands.Allacrossthecountry,honeybeesareleavingtheirhivesandneverreturning.Researcherscallthisphenomenoncolony-collapse1disorder.Accordingtosurveysofbeekeepersacrosst

2、hecountry,25to40percentofthehoneybeesintheUnitedStateshavevanishedfromtheirhivessincelastfall.Sofar,noonecanexplainwhy.　　Colonycollapseisaseriousconcernbecausebeesplayanimportantroleintheproductionofaboutone-thirdofthefoodsweeat.Astheyfeed,honeybeesspreadpollenfromflow

3、ertoflower.Withoutthisprocess,aplantcan’tproduceseedsorfruits.　　Now,agroupofscientistsandbeekeepershaveteameduptotrytofigureoutwhat’scausingthealarmingcollapseofsomanycolonies.Bysharingtheirexpertiseinhoneybeebehavior,health,andnutrition,teammembershopetofindoutwhat’sc

4、ontributingtothedeclineandtopreventbeedisappearancesinthefuture.　　Itcouldbethatdiseaseiscausingthedisappearanceofthebees.Toexplorethatpossibility,JayEvans,aresearcherattheUnitedStatesDepartmentofAgriculture(USDA)BeeResearchLaboratory2,examinesbeestakenfromcoloniesthata

5、recollapsing.“Weknowwhatshealthybeeshouldlooklikeontheinside,andwecanlookforphysicalsignsofdisease,”hesays.Andbeesfromcollapsingcoloniesdon’tlookveryhealthy.“Theirstomachsareworndown,comparedtothestomachsofhealthybees,”Evanssays.Itmaybethataparasiteisdamagingthebees’di

6、gestiveorgans.Theirimmunesystemsmaynotbeworkingastheyshould.Moreover,theyhavehighlevelsofbacteriainsidetheirbodies.　　Anothercauseofcolony-collapsedisordermaybecertainchemicalsthatfarmersapplytokillunwantedinsectsoncrops,saysJerryHayes,chiefbeeinspectorfortheFloridaDepa

7、rtmentofAgriculture3.Somestudies,hesays,suggestthatacertaintypeofinsecticideaffectsthehoneybee’snervoussystem(whichincludesthebrain)andmemory.“Itseemslikehoneybeesaregoingoutandgettingconfusedaboutwheretogoandwhattodo,”hesays.　　Ifitturnsoutthatadiseaseiscontributingtoc

8、olonycollapse,bees’genescouldexplainwhysomecolonieshavecollapsedandothershavenot.Inanygroupofbeestherearemanydifferen