7J Willis. A Framework for Task-based Learning [ M ] .Harlow,UK:Subject Centre for Languages,1996.
8MH Long.Focus on Form: A Design Feature in Language Teaching Methodology [ C ] //C Kramsch & R Ginsberg. Foreign Language Research in Cross Cultural Perspective.Amsterdam: John Benjamins,1991.
9DJ Willis.Varied Activities for Variable Language [ J ] . Eh Journal, 1997 (1).
10D Willis, J Willis. Doing Task-based Teaching [ M ] .New York: Oxford University Press, 2007.
