英语专业八级改错模拟题
ofthenaturevitaminCandthechemicalstructure
ofthesyntheticvitaminC.Also,whilemostsub- stancesareharmlessatverylowlevelofintake,all
substance--eventheelementsthatareessentialtolife--canbedangerousifyouoverdothem.Takewaterforexample.Sixoreightglassesadaywillkeepyourbodyingoodfluidbalance.Butyoucanalsobedrown
init.Somepeoplearguethatindividualsvarygreatly
intheirneedfornutrients,itcannotnecessarilybestatedanygivenamountistoomuch;thatisall
relative.Butsincethereislittlesolidinformationonwhatistheoptimalintakeofanyessentialnutrientinhealthyindividuals,itwouldbeimpossibletogiveguidelinesthattaketheseproportionalneedsintothe
account.Justaswithotherdrugs,therelationto
differentvitamindosagesvaries,withsomepeoplebetterablethanotherstotoleratelargeamounts.Whilewedoknowthatveryspecificallywhatthetoxiclevel