6[1]Brown, H.D. Principles of Language Learning and Teaching [M]. Shanghai: Shanghai Foreign Language Education Press,2001.
7[2]Bachman, L. Fundamental Considerations in Language Testing [M]. Oxford University Press, 1990.
8[3]Canale, M. and Swain, M. Theoretical bases of communicative approaches to second language teaching and testing[J]. Applied Linguistics, 1980,1(1) :1-47.
9[4]Chomsky, N. Aspects of the Theory of Syntax[M]. M. I. T.Press, 1965.
10[5]Corder, S. P. The significance of learner's errors [J].International Review of Applied Linguistics, 1967,5 (4) : 161-170.
