5Bargiela-Chiappini F & Zhang Z C. Business English [ A]. In Paltridge B & Starfield S (eds.). The Hand- book of English for Specific Purposes [ C ]. Boston : Wiley-Blackwell, 2013. 193-212.
6Dudley-Evans T & St John M. Developments in ESP: A Multi-disciplinary Approach [ M]. Cambridge: Cam- bridge University Press, 1998.
7Hutchinson T & Waters A. English for Specific Purposes : A Learning-centered Approach [ M ]. Cambridge : Cambridge University Press, 1989.
8Widdowson H. Teaching Language as Communication [ M]. Oxford: Oxford University Press, 1978.