1Bialystok,E. A theoretical model of second language learning [J].language Learning, 1978,(28):69-84.
2Ellis,N. Frequency effects in language processing: A review with implications for theories of implicit and explicit language acquisition [J 1 .SSLA,2002,(24): 143-188.
3Krashen,S. The Input Hypothesis: Issues and Implication [ M ] .London:Longrnan, 1985.
4Swain,M. Communicative competence:some roles of comprehensible input and comprehensible output in its development [A~.in S.Gass & G.Madden(ed.).Input in Second Language Acquisition [ C ].Rowley,MA: Newbury House Publishers, 1985.
