3[1]Bro n H.D.Teaching by Principles[M].Upper Saddle River,NJ:Prentice Hall Regents,1994.
4[2]Donato R.Collective Scaffolding in Second Language Learning[A].In J.P.Lantolf and G.Appel (eds.) Vygostkian Approaches to Second Language Research[C].Norwood,New Jersey:Ablex Publishing,1994.
5[3]Celeste Kinger.Proximal Development in US Foreign Language Education[J].Applied Linguistics,2002(2):240～261.
6[4]Krashen S.D.The Input Hypothesis:Issues and Implications[M].London:Longman,1985.
7[5]Mckenzie J.Scaffolding for Success,From Now On[J].The Educational Technology Journal,1999,(4):39～47.
8[6]Wertsch J.V.The Concept of Activity in Soviet Psychology:An Introduction[A].In J.V.Wertsch (Ed.),The Concept of Activity in Soviet Psychology[C].New York:M.E.Sharpe,Inc.,1981.
9[7]Wood D.J.,J.S.Bruner,G.Ross.The Role of Tutoring in Problem Solving[J].Journal of Child Psychology and Psychiatry,1976,(2):89～100.
10Wertsch J V . Tulviste P . Vygotsky and contemporary developmental psychology. In Lloyd P, Fernyhough C, LEV Vygotsky Critical Assessment, London and New York: Routledge, 1999, Vol. 1 , 9-26.
