8Dovey T. What purposes, specifically? Re-thinking purposes and specificity in the context of "new vocationalism" [ J ]. English for Specific Purposes, 2006, ( 25 ).
9Dudley-Evans T & St John M J. Developments in ESP [ M]. Cambridge: CUP, 1998.
10Dupuy B. Content-Based Instruction: Can it help ease the transition from beginning to advanced foreign language classes? [J]. Foreign Language Annals, 2000, (33/2) : 205 -223.
