7Nunan, D. Designing tasks for the communicative class-room [M]. Cambridge: Cambridge University Press, 1989: 10. 被引量:1
8Richards, J. C., Platt, J., &Platt, H. Longman dic- tionary of language teaching & applied linguistics [ M ]. Bei- jing: Foreign Language Teaching and Research Press, 2000. 469. 被引量:1
9Krashen, S. Principles and practice in second language acquisition [ M ]. Oxford : Oxford University Press, 1982. 被引量:1
10Swain, M. Communicative competence: Some roles of comprehensible input and comprehensible output in its develop- ment [M]. Rowly, MA: Newbury House, 1985. 被引量:1