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1、精品文档2006职称英语考试模全真拟试题理工类B级（一）Irradiatingfruits,vegetables,porkandchickentokillinsectsandbacteriahasbeenapprovedbytheFoodandDrugAdministrationoverthepastdecadeorso.Irradiationofothermeats,suchasbeefandlamb,isbeingreviewed.Federalapprovaldoesnotrequirethatindustryadopttheprocess,andfewfoodproc
2、essorspresentlyofferirradiatedproducts.Marketstudieshaveshownthatmanyconsumersareafraidthateatingirradiatedfoodsmaycausecancer,despitescientificstudiesthatprovethesafetyoftreatedfoods.Somepeoplearguethatmoreseveregovernmentinspection,higherfood-safetystandards,andmorecareful-preparationprac
3、ticesbyconsumersareallthatisneededtoensurethatfoodissafe.Consequently,companiescurrentlyseenoneedtospendmillionsofdollarsoutfittingprocessingplantswiththeequipmentnecessaryforaprocessthatveryfewshoppersareinfavorof.Allsupermarketsthatsellirradiatedfoodmustlabelthefoodeitherdirectlyonthepack
4、aging,or,inthecaseofbulkitemslikefruitsandvegetables,by2016全新精品资料-全新公文范文-全程指导写作–独家原创15/15精品文档placingasignnearby.Thereisnorequirementforthelabelingofirradiatedfoodservedbychainrestaurantsorhospitalsthatbuydirectlyfromdistributors,noranyregulationsforproductsthatcontainirradiatedingredients.P
5、resently,theFDAallowsfoodtobetreatedwiththreetypesofradiation--gammarays,high-energyelectrons,andXrays--andsetslimitsondoses,dependingonthetypeoffood.Theprincipleisthatthedosetobeusedforacertaintypeoffoodshouldnotexceedtheamountthatissufficienttokillmostharmfulinsectsandbacteriapresentinit.
6、Differenttypesoffood,becauseoftheirmolecularcompositions,mayrequiredifferentdosesofradiation.TheRussianMirSpaceStation,whichcamedownin2001atlastafter15yearsofpioneeringtheconceptoflong-termhumanspaceflight,isrememberedforitsaccomplishmentsinthehumanspaceflighthistory.Itcanbecreditedwithmany
7、firstsinspace.DuringMir’slifetime,RussiaspentaboutUS$4.2billiontobuildandmaintainthestation.TheSovietUnionlaunchedMir,whichwasdesignedto2016全新精品资料-全新公文范文-全程指导写作–独家原创15/15精品文档lastfromthreetofiveyears,onFebruary20,1986,andhoused104astronautsover12yearsands
