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权力方面的限制作用

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Thefoodweeatseemstohaveprofoundeffectsonourhealth.Althoughsciencehasmadeenormousstepsinmakingfoodmorefittoeat,ithas,atthesametime,mademanyfoodsunfittoeat.Someresearchhasshownthatperhapseightypercentofcancerisrelatedtothedietaswell,especiallycancerthecolon.Differentculturesaremorepronetocontractcertainillnessesbecauseofthefoodthatischaracteristicinthesecultures.Thatfoodrelatedtollnessisnotanewdiscovery.In1945,governmentresearchersrealizedthatitratesandnitrites,commonlyusedtopreservecolorinmeats,andotherfooddditives,causedcancer.Yet,thesecarcinogenicadditivesremaininourfood,nditbecomesmoredifficultallthetimetoknowwhichthingsonthepackginglabelsofprocessedfoodarehelpfulorharmful.Theadditiveswhichweeatarenotallsodirect.Farmersoftengivepenicillintobeefandpoultry,andbecauseofthis,penicillinhasbeenfoundinthemilkoftreatedcows.Sometimessimilardrugsareadministeredtoanimalsnotformedicinalpurposes,butforfinancialreasons.Thefarmersaresimplytryingtofattentheanimalsinordertoobtainahigherpriceonthemarket.AlthoughtheFoodandDrugAdministration(FDA)hastriedrepeatedlytocontroltheseprocedures,thepracticescontinue. 48.Whatisthemaintopicofthepassage? A.Foodandourhealth BFoodandadditives C.Foodandcancer DFoodandculture 49AllofthefollowingstatementsaretrueEXCEPT_______. AFortypercentofcanceriscausedbyproblemsrelatedtofood. BResearchershaveknownaboutthepotentialdangeroffoodadditivesformanyyears C.Weeatsomeofthefoodadditivesdirectlyandsomeindirectly DDrugsarealwaysgiventoanimalsformedicinalpurposes 50.Whydofarmersgivedrugstotheiranimals? A.tospeedupthegrowthofanimals BTomaketheanimalsfatter Ctomaketheanimals’meatfittoeat DTomaketheanimals’meatrichinnutrients 51.Itcanbeinferredfromthepassagethat_________. Ascientisthavemadeallthefoodfittoeat Bonlyinrecentyearshavepeoplefoundthatthefoodisrelatedtoone’sillness Callkindsofcancerarerelatedtothediet Dsomeadditivesareharmfultoourhealth 52.Theword“this”inthesecondsentenceofparagraph2mostprobablyrefersto__________. Afarmer Bpenicillin Cbeefandpoultry Dthefactthatfarmersoftengivepenicillintoabeef
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