6Brown, H.D. Principles of Language Learning and Teaching[M]. Longman Inc.,2000.
7Canale, M. and M. Swain. Theorectical basis of communicative approaches to second language teachig and testing [ J]. Applied Linguistics, 1980 (1) : 1-47.
8Ellis, R. Understanding Second Language Acquisition[M]. Oxford University Press, 1985.
9Harmer, J. The Practice of English Language Teaching [M].New York:Longman Inc.,1983.
10Howatt, A. P. R. A History of English Language Teaching[M].Oxford University Press, 1984.
