3Berwick R. Needs assessment in language programming: From theory to practice[A]. InR.Johnson (ed.) . The Second Language Curriculum [C]. Cambridge: CUP. 1989: 48-62.
4Hutchinson, T. &A. Water. English for Specific Purposes--A Learning centered Approach [M] .Cambridge: CUP. 59.1987: 29.
5OMalley, J.M.&Chamot. A Learning Strategy in Second Language Acquisition[M]. Cambridge: CUP, 1990: 172.