3[3]Pica, T. Choosing and using communicative tasks for second language interaction[ A]. Grookes and Grass:Tasks and Language Learning[ C ]. Avon:Multilingual Matters, 1993.
4[4]Skehan, P. A framework for the implementation of task - based instruction [ J]. Applied linguistics, 1996,17:38 - 32.
5[5]Nunan, D. De signing Tasks for the Communicative Classroom [ M ]. Cambridge: CUP, 1989.
6[6]Skehan,P. A Cognitive Approach to Language Learning[ M]. Oxford: OUP, 1998.
7[7]Willis,J.A Framework for Task- based Learning[M] .London:Longman, 1996.
8O' Malley J M, Chamot A U. learning Strategies in Second Language Acquisition [ M ]. Cambridge: Cambridge University Press,1990.16.
9Libben G, Jarema G. Mental Lexicon Research in the New Millennium[J]. Brain and language,2002(3) :3 -4.
10Craik F, Tulving E. Depth of Processing and the Retention of Words in Episodic Memory[ J]. Journal of Experimental Psychology,1975 (2) :268 -284.
