4Willis D. A Framework for Task-based Learning[M]. London: Longman, 1996.
5Crookes G. Task Classification: A Cross Disciplinary Review (Tech. Rep. No. 4)[M]. Honolulu: Social Science Research Institute, Center for Second Language Classroom Research. University of Hawaii at Manoa, 1986.
6Cele-Murcia, Mariane. Discourse analysis and the teaching of listening[A]. In Guy Cook and Seidlhofter Barbara(eds. ). Principles& Practice in Applied Linguistics[C]. Oxford: Oxford University Press, 1995.
7Ellis, R. The Study of Second Language Acquisition[M]. Oxford:Oxford University Press, 1994.
8Larman, C. Applying UML and Patterns: An Introduction to Object-Oriented Analysis and Design[M]. Upper Saddle River, N J: Prentice Hall, 1998.
9Nunan, D. Designing Tasks for the Communicative Classroom [M]. Cambridge: Cambridge University Press, 1989.
10Nunan, D. Communicative tasks and language curriculum[J]. TESOL Quarterly, 1991,25(2) : 279-295.
