英语四级考试辅导试题及答案

XX年英语四级考试辅导试题及答案 　Only the selfless can be fearless. 以下是为大家搜索的xx年辅导试题及答案，希望能给大家带来帮助!更多精彩内容请及时关注我们!

XX年英语四级考试辅导试题及答案 Onlytheselflesscanbefearless.以下是为大家搜索的 xx年辅导试题及答案，希望能给大家带来帮助!更多精彩内容请及 时关注我们! Thefoodweeatseemstohaveprofoundeffectsonour health.Althoughsciencehasmadeenormousstepsinmaking foodmorefittoeat,ithas,atthesametime,mademany foodsunfittoeat.Someresearchhasshownthatperhaps eightypercentofallhumanillnessesarerelatedtodiet andfortypercentofcancerisrelatedtothedietas well,especiallycancerofthecolon.Differentculturesare morelikelytocausecertaindifferentillnessesbecauseof thefoodthatischaracteristicinthesecultures.That foodisrelatedtoillnessisntoanewdiscovery.In1945, about35yearsago,governmentresearchersrealizedthat nitrates,monlyusedtopreservecolorinmeats,andother foodadditivies,causedcancer.Yet,thesecarcinogenic additivesremaininourfood,anditbeesmoredifficult allthetimetoknowwhichthingsonthepackaginglabels ofprocessedfoodarehelpfulorharmful.Theadditives whichweeatarenotallsodirect.Farmersoftengive penicillintobeefandlivinganimals,andbecauseofthis ,penicillinhasbeenfoundinthemilkoftreatedcow. Sometimessimilardrugsaregiventoanimalsnotfor medicalpurposes,butforfinancialreasons.Thefarmersare