题目内容：
QuestionsarebasedonthefollowingpassageTodayourknowledgeoffoodandwhatitdoesforourbodiesarefarmoreadvancedthanthatoftheoldtimes.Nowweknowaboutvitaminsandhoweachkindofvitaminhelpsinthegrowthofaparticularpartofourbody.Thereareonthemarketallkindsofvitaminswhichonecantaketomakeupforone’slackofcertainimportantthings,whichareneededforgoodhealth.Ofcourse,ifweeatwellandproperly,thefoodthatweeatwilltakecareofourbodyandsothereisnoneedtotakeanykindsofvitaminsunlessourdoctortellsusthatourbodiesareshortofsomething,whichcanbesuppliedbythem.Generallyspeaking,everythingweeatdoessomegoodtoourbody,butifweeattoomuchofonekindoffoodandpaytoolittleattentiontoothers,wemayhavetoomuchofonekindandnotenoughofothers.Thenwemaybeintrouble.
Weareoftentoldthatwemusteatsomemeatateachmealinordertogetthenecessaryproteins.Thatisonlypartlytrue,forproteinsarenotfoundonlyinmeat.Wecanalsogetthemfromsomevegetables.
Thebestadviceaboutwhattoeatiswhatweshouldeatallkindsoffoodbutnevertoomuchofany.<Onemaytakecertainvitaminswhen_______. A．onewantstoencouragethegrowthofaparticularpartofthebody
B．oneeatsallkindsoffood
C．one’shealthisharmedbythelackofcertainthingswhichcanbesuppliedbyvitamins
D．oneeatswellandproperly
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答案解析：