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