[考试宝典]2011职称英语理工ab级阅读理解精讲

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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.Accordingtosurveysofbeekeepersacrossthecountry,25to40per

2、centofthehoneybeesintheUnitedStateshavevanishedfromtheirhivessincelastfall.Sofar,noonecanexplainwhy.　　Colonycollapseisaseriousconcernbecausebeesplayanimportantroleintheproductionofaboutone-thirdofthefoodsweeat.Astheyfeed,honeybeesspreadpollenfromflowertoflower.Withoutthisprocess,aplantca

3、n’tproduceseedsorfruits.　　Now,agroupofscientistsandbeekeepershaveteameduptotrytofigureoutwhat’scausingthealarmingcollapseofsomanycolonies.Bysharingtheirexpertiseinhoneybeebehavior,health,andnutrition,teammembershopetofindoutwhat’scontributingtothedeclineandtopreventbeedisappearancesinthe

4、future.　　Itcouldbethatdiseaseiscausingthedisappearanceofthebees.Toexplorethatpossibility,JayEvans,aresearcherattheUnitedStatesDepartmentofAgriculture(USDA)BeeResearchLaboratory2,examinesbeestakenfromcoloniesthatarecollapsing.“Weknowwhatshealthybeeshouldlooklikeontheinside,andwecanlookfor

5、physicalsignsofdisease,”hesays.Andbeesfromcollapsingcoloniesdon’tlookveryhealthy.“Theirstomachsareworndown,comparedtothestomachsofhealthybees,”Evanssays.Itmaybethataparasiteisdamagingthebees’digestiveorgans.Theirimmunesystemsmaynotbeworkingastheyshould.Moreover,theyhavehighlevelsofbacter

6、iainsidetheirbodies.　　Anothercauseofcolony-collapsedisordermaybecertainchemicalsthatfarmersapplytokillunwantedinsectsoncrops,saysJerryHayes,chiefbeeinspectorfortheFloridaDepartmentofAgriculture3.Somestudies,hesays,suggestthatacertaintypeofinsecticideaffectsthehoneybee’snervoussystem(whic

7、hincludesthebrain)andmemory.“Itseemslikehoneybeesaregoingoutandgettingconfusedaboutwheretogoandwhattodo,”hesays.　　Ifitturnsoutthatadiseaseiscontributingtocolonycollapse,bees’genescouldexplainwhysomecolonieshavecollapsedandothershavenot.Inanygroupofbeestherearemanydifferen