III．阅读理解（共20小题；每小题1.5分；满分30分）AThefoodweeatseemstohaveagreateffectonourhealth.Althoughsciencehasmadebigstepsinmakingfoodmorefittoeatithasatthesametimemademan

　　III．阅读理解（共20小题；每小题1.5分；满分30分）

　　A

　　Thefoodweeatseemstohaveagreateffectonourhealth.Althoughsciencehasmadebigstepsinmakingfoodmorefittoeatithasatthesametimemademanyfoodsunfittoeat.Someresearchhasshownthatperhapseightypercentofhumanillnessisrelatedtofoodandfortypercentofcancerisrelatedtofoodaswell.Thatfoodisrelatedtoillnessisnotanewdiscovery.In1945someresearchersrealizedthatthingscommonlyusedtokeepcolorinmeatsandotherfoodadditives（添加剂）causedcancer.

　　Yettheseadditivesremaininourfoodanditisdifficulttoknowwhichthingsonthewrappingsoffoodsarehelpfulorharmful.Theadditiveswhichweeatarenotallsodirect.Farmersoftengivepenicillin(青霉素)totheiranimalsandbecauseofthispenicillinhasbeenfoundinthemilkofcows.Sometimessimilartingsaresuppliedtoanimalsnotfortheirhealthbutjusttomakeaprofit.

　　Thefarmersaresimplytryingtofattentheanimalsinordertogetahigherpriceonthemarket.Althoughsomecountrieshavetriedtocontrolsuchthingsthepracticecontinues.

　　51.Accordingtothispassagewecanknow___________.

　　A.cancerwasdiscoveredin1945

　　B.sciencehasmadefoodunfittoeat

　　C.perhapsmostofhumanillnessiscausedbywhatweeat

　　D.perhapsmostkindsofcancerarerelatedtowhatpeopleeat

　　52.Theadditivesinfood_________.

　　A.arebrightandcolorless B.haveindirecteffectsonourhealth

　　C.havedirecteffectsonourhealth D.havedirectandindirecteffectsonourhealth

　　53.Peopleuseadditives_________.

　　A.tochangecolorofthefood B.tomakefoodmoreunfittoeat

　　C.totakeoffthediseasesofthefood D.toimprovethecolorandtasteofthefood

　　54.WhichofthefollowingisNottrue?

　　A.Weneedn’ttakecareofwhatweeat.

　　B.Somewrappingsoffoodareharmful.

　　C.“Thepracticecontinues”means“thingsarestillgoingonlikethat”.

　　D.Farmerstrytomakemoremoneyonthemarketbyfatteningtheiranimals.