一、前言近年来,第二语言教学法研究的焦点已从单纯研究教学方法转向了第二语言学习过程中最重要的因素,即课堂相互作用。音像技术的飞速发展使得丰富多彩的第二语言课堂交际活动得以生动再现,课堂相互作用的精密细致的分析促进了新近的语言研究(Johnson1995,Lynch1996)。正是在此期间,“任务”这一词汇,作为第二语言 I. Preface In recent years, the focus of the study of second language teaching has shifted from simple research and teaching methods to the most important factor in the process of second language learning, namely, classroom interaction. The rapid development of audiovisual technology has enabled the vivid reproduction of a variety of second-language classroom communicative activities. The careful analysis of classroom interactions has facilitated recent linguistic studies (Johnson 1995, Lynch 1996). It is during this period that the term “task” is used as a second language