[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.Accordingtosurveysofbeekeepersacrossthecou

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

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

4、edeclineandtopreventbeedisappearancesinthefuture.　　Itcouldbethatdiseaseiscausingthedisappearanceofthebees.Toexplorethatpossibility,JayEvans,aresearcherattheUnitedStatesDepartmentofAgriculture(USDA)BeeResearchLaboratory2,examinesbeestakenfromcoloniesthatarecollapsing.“Weknow

5、whatshealthybeeshouldlooklikeontheinside,andwecanlookforphysicalsignsofdisease,”hesays.Andbeesfromcollapsingcoloniesdon’tlookveryhealthy.“Theirstomachsareworndown,comparedtothestomachsofhealthybees,”Evanssays.Itmaybethataparasiteisdamagingthebees’digestiveorgans.Theirimmune

6、systemsmaynotbeworkingastheyshould.Moreover,theyhavehighlevelsofbacteriainsidetheirbodies.　　Anothercauseofcolony-collapsedisordermaybecertainchemicalsthatfarmersapplytokillunwantedinsectsoncrops,saysJerryHayes,chiefbeeinspectorfortheFloridaDepartmentofAgriculture3.Somestudi

7、es,hesays,suggestthatacertaintypeofinsecticideaffectsthehoneybee’snervoussystem(whichincludesthebrain)andmemory.“Itseemslikehoneybeesaregoingoutandgettingconfusedaboutwheretogoandwhattodo,”hesays.　　Ifitturnsoutthatadiseaseiscontributingtocolonycollapse,bees’genescouldexplai

8、nwhysomecolonieshavecollapsedandothershavenot.Inanygroupofbeestherearemanydifferen