Calciumisimportantforourhealth.Wemusthaveitinourdiettostaywell.Agoodplacetogetitisfromdairyproductslikemilk,cheeseandicecream.Onepoundofcheesehasfiftytimesthecalciumweshouldhaveeveryday.Otherfoodshaveless.Forexample,apoundofbeansalsohascalcium.Butithasonlythreetimestheamountweoughttohavedaily.
英语学习辅导：高考指导版
2005年4期
