Dudley-Evans T & St John M J . Developments in English for Specific Purposes:A Multi-disciplinary Approach[M]. Cambridge: Cambridge University Press, 1998.
[2]
Jordan R R. English for Academic Purposes:A Guide and Resource Book for Teachers[M]. Cambridge: Cambridge University Press, 1997.
[3]
Long M H. Second Language Needs Analysis[M]. Cambridge: Cambridge University Press, 2005: 1.
[4]
Mackey A & Gass S M . Research Methods in Second Language Acquisition:A Practical Guide[M]. Chichester: Wiley-Blackwell, 2012: 74~ 94.