#写作:GRE作文ARGUMENT126篇真题五六 搜索结果
56、Typically,aspeopleage,theirbonemassdecreases,makingthemmorevulnerabletobonefractures.ArecentstudyconcludesthatthemosteffectivewaytoreducetheriskoffracturesinlaterlifeistotaketwicetheremendeddoseofvitaminD