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英语专业八级改错模拟题

分类: 英语  时间: 2023-06-12 00:17:26  作者: 全国等级考试资料网 
  Vitamins,likeminerals,arechemicals.Thereisabsolutelynotdifferenceinthechemicalstructure

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

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