铝作为食品污染源之一，广泛存在于各种膨化食品中，成人每日摄入量应控制在4mg以下。炸油条时需加入明矾晶体作为膨松剂。已知明矾晶体的化学式为KAl(SO4)2·12H2O，相对分子质量为474。
阅读理解。
Hello! My nameis Alice. There are seven people in my family. My grandfather and grandmotherare in America. My parents are English teachers in China. I have two brothers.They are twins. We are students in the same school. I am in Grade One. They arein Grade Three.
4个 313 的和是____ ？
孔繁森、郑培民、牛玉儒等被誉为新时期党的好干部、时代先锋。下列人物中属于此类的是（ ）
名著阅读
