6McDevitt B.Learner Autonomy and the Need for Learner Training [J] .Language Learning Journal, 1997, (9) : 34-39.
7Higgs J. Planning Learning Experiences to Promote Autonomous Learning [C]//Boud . D. Developing Student Autonomy. London: Kogan Page, 1988: 40-59.
8Bialystock E. A Theoretical of Second Language Learning [J] .Lan- guage Learning, 1978, (28) : 69-84.
9Tarone E. Some Thoughts on the Notion of Communication Strategy [C] //Faereh G, Kasper G.Strategies in Inter-language Communi- cation.London: Longman, 1983: 61-74.
10O'Malley J M, Chamot A U.Learning Strategies in Second Language Acquisition [M] .Cambridge: Cambridge University Press, 1990: 41.