1Ellis, R. ( 1985 ) Understanding Second Language Acquisition. Oxford: Oxford University Press.
2Krashen,S. D. (!982) Principles and Practice in Second Language Acquisition. New York: Pergamon Press Ltd..
3Swain,M. (1995) Three functions of output in second language learning. In G. Cook & B. Seidlhofer ( Eds. ) , Principles & Practice in Applied Linguistics. Oxford : OUP.
5[1]Flood, James & Lapp, Diane. Reading and Writing Relationship: Assumptions and Directions [ A]. In James R.Squire (ed).The Dynamics of Language Lerning [c] Urbaba Ⅲ: ERIC Cleringhouse on Reading and Communication Skills. 1987.
6[2]Kucer, Stephen B. The Cognitive Base of Reading and Writing [A]. In James R. Squire (ed). The Dynamics of Language Learning [c] Urbaba Ⅲ: ERIC Clearinghouse on Reading and Communication Skills. 1987.
7[3]Swain, M. 1994. Three functions of output in second language learning [A]. cited in Cook, C & Seidlhofer, B.1995. Principles & Parctice in Applied Linguistics. [C]上海外语教育出版社125 44.
