1Krashen S D. Principles and Practice in Second Language Acquisition [M]. Oxford: Pergamon Press, 1982.
2Swain M, Communicative Competence: Some Roles of Comprehensible Input and Comprehensible Output in Its Development [M]. Rowley, Mass :Newbury House, 1985.
6Gray D. The internet in school [ M ]. London and New York: Cassell, 1999.
7David Jonassen. Constructivism and Computer-Mediated Communication in Distance Education [ J ]. The American Journal of Distance Education, Vol. 9, No. 2, 1995.
8Kafai, Y.. & Resnik, M. Constructivism in practice:Designing, thinking and learning in a digital world[ M].Mahwah, NJ: Lawrence Erlbaum Associations, 1996.
9omas Scovel. Psycholinguistics [ M ]. Oxford University Press, 1998.
10Rod Ellis. Second Language Acquisition[M]. Oxford University Press, 1998.
