1Ellis ,R.The Study of Second Language Acquisition[M ]. Oxford: OUP, 1994.
2Maclntyre, P. D.& Gardner,R_ The subtle effects of language anxiety on cognitive processing in the second language[J ]. Language Learning, 1994, ( 44 ).
3Horwitz, E., Horwitz, M. & Cope, J. Foreign language classroom anxiety (A). In E. Horwitz &D. Young (Eds). Language Anxiety;from theory and research to classroom implications [M].Englewood Cliffs,NJ:Prentice Hall, 1991.
4Krashen, S. The Input Hypothesis: Issues and Implicafion[M ].London : Longman, 1985.
