6Bruton A. From tasking purposes to purposing tasks[J]. English Language Teaching Journal, 2002, 56 (3) : 280- 288.
7Jonassen D K Peck, B Wilson. Learning With Technology Constructivist Perspective [J]. Prentice Hall. Inc, 1999:192-215.
8Lantolf, J. Sociocultural theory and second language learning[M]. Oxford: Oxford University Press,2000.
9Long M. A role for instruction in second language acquisition: Task-based language training[A]. K Hyltenstam & M Pienemann (Eds.). Modelling and assessing second language acquisition. Clevedon, Avon: Multilingual Matters, 1985:77-100.
10Long M Task, group, and task-group interaction[A]. University of Hawaii Working papers in English as a Second Language1989, (8) : 8:1-26.
5Appel, G. and Lantolf, J. Speaking as Mediation: A Study of L1 and L2 Text Recall Tasks [ J ]. The Modem Language Journal, 1994, ( 78 ) :437 - 52.
6Brown, G. & Yule,G. Teaching the Spoken Language[M].Cambridge : Cambridge University Press, 1983.
7Coughlan, P. , and Duff, P. Same Task, Different Activities: Analysis of a Second Language Acquisition Task from an Activity Theory Perspective [ A ]. In J. P. Lantolf and G.Appel (Eds.) : Vygotskian Approaches to Second Language Research ( pp. 173 - 193 ) [ C ]. Norwood, NJ : Ablex,1994.
8Cummins, J. & Sayers, D. Brave New Schools : Challenging Illiteracy[M]. NY. St. Martin's Press,1997.
9Long, M. H. Input and Second Language Acquisition[ A].In Gass, S. M. & C. Madden (Eds.): Input in Second Language Acquisition [ C ]. Rowley, MA : Newbury House,1985.
10Long, M. H. The Role of the linguistic Environment in Second Language Acquisition[ A]. In Ritchie, W. C. & T. K.Bhatia (Eds.) : Handbook of Second Language Acquisition[C]. San Diego, CA: Academic Press,1996.
