[8]North B. & Schneider G. Scaling descriptors for language proficiency scales[J].Language Testing,1998,15(2):217-262. 刘建达,彭川.构建科学的中国英语能力等级量表[J].外语界,2017（2）：5-7
[10]Douglas, D. Assessing Language for Specific Purposes[M].Cambridge: Cambridge University Press, 2000.
[11]Swales J. Episodes in ESP: A Source and Reference Book on the Development of English for Science and Technology[C]. Oxford: Pergamon Institute of English, 1985
[12]Strevens P. ESP after twenty years: A re-appraisal A. In Tickoo[M].L （ed.）. ESP: State of the Art[C].. Singapore: SEAMEO Regional Language Center, 1998.1-13
[13]Douglas, D. Assessing Language for Specific Purposes[M].Cambridge: Cambridge University Press, 2000.
