[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.Accordingtosurveysofbe

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

3、,honeybeesspreadpollenfromflowertoflower.Withoutthisprocess,aplantcan’tproduceseedsorfruits.　　Now,agroupofscientistsandbeekeepershaveteameduptotrytofigureoutwhat’scausingthealarmingcollapseofsomanycolonies.Bysharingtheirexpertiseinhoneybeebehavior,health

4、,andnutrition,teammembershopetofindoutwhat’scontributingtothedeclineandtopreventbeedisappearancesinthefuture.　　Itcouldbethatdiseaseiscausingthedisappearanceofthebees.Toexplorethatpossibility,JayEvans,aresearcherattheUnitedStatesDepartmentofAgriculture(US

5、DA)BeeResearchLaboratory2,examinesbeestakenfromcoloniesthatarecollapsing.“Weknowwhatshealthybeeshouldlooklikeontheinside,andwecanlookforphysicalsignsofdisease,”hesays.Andbeesfromcollapsingcoloniesdon’tlookveryhealthy.“Theirstomachsareworndown,comparedtot

6、hestomachsofhealthybees,”Evanssays.Itmaybethataparasiteisdamagingthebees’digestiveorgans.Theirimmunesystemsmaynotbeworkingastheyshould.Moreover,theyhavehighlevelsofbacteriainsidetheirbodies.　　Anothercauseofcolony-collapsedisordermaybecertainchemicalsthat

7、farmersapplytokillunwantedinsectsoncrops,saysJerryHayes,chiefbeeinspectorfortheFloridaDepartmentofAgriculture3.Somestudies,hesays,suggestthatacertaintypeofinsecticideaffectsthehoneybee’snervoussystem(whichincludesthebrain)andmemory.“Itseemslikehoneybeesa

8、regoingoutandgettingconfusedaboutwheretogoandwhattodo,”hesays.　　Ifitturnsoutthatadiseaseiscontributingtocolonycollapse,bees’genescouldexplainwhysomecolonieshavecollapsedandothershavenot.Inanygroupofbeestherearemanydifferen