4GeorgeYule.How to Teach English[M].北京：外语教学与研究出版社,2000.10.
5[1]Halliday & Mcintosh.The linguistics science and language teaching[M].London:Langman,1964.
6[2]Hutchinson,A.Walters.English for specific purpose:A learning-centered approach[M].Cambridge:Cambridge University Press,1987.
7[4]Cummins,J.Cognitive academic language proficiency,linguistic interdependence,the optimum age question and some other matters[J].Working papers on bilingualism.1979.121-129.
8[6]Wilkins P.National Syllabus[M].Oxford University press.1976.
9[7]Hall D.Materials production:theory and practice[A].In Hidigo A Cet al.(ed) getting started:Materials writers on materials writing[C].Singapore Regional Language Center,199.
10[1]Strevens P.ESP after twenty years:A re-appraisal[A].M.Tickoo(Ed.).ESP:State of the Art[C].SEAMEO Regional Language Centre,1988.1-13.
