The preface analyses the inevitability of WBE in U.S.A. and points out the start of being digital in China and the problems of our education reform, then the purpose of this thesis.

• 文章前言分析了网络教育诞生于美国的历史必然性，指出我国的社会信息化刚刚起步及教育改革中出现的问题，说明了本文的研究意义。