一、主食发展变化的基本特征主食是人类赖以生存的基本需求,在历史的长河中,人们对主食的认识在不断的深化和调整,随着经济的发展和社会的进步,主食的概念也在不断完善和升级之中。目前,大家对主食的概念已经取得了基本共 First, the basic characteristics of the development of staple food staple food is the basic needs of human survival, in the long history, people’s understanding of staple food is constantly deepening and adjustment, with the economic development and social progress, the concept of staple food In the continuous improvement and upgrading. At present, everyone has made the basic concept of staple food