1996年年全真试题Part?ClozeTestVitaminsareorganiccompoundsnecessaryinsmallamountsinthedietforthenormalgrowthandmaintenanceoflifeofanimals,includingman.Theydonotprovideenergy,1dotheyconstructorbuildanypartofthebody.Theyareneededfor2foodsintoenergyandbodymaintenance.Therearethirteenormoreofthem,andif3ismissingadeficiencydiseasebecomes4.Vitaminsaresimilarbecausetheyaremadeofthesameelements—usually...