1Jordan,R. English for Academic Purposes [ M ]. Cambridge: Cambridge University Press,1997.
2Richards, J.C. PLAttand PLATI'. Longman Dictionary of Language Teaching & Applied Linguistics [M].Beijing:For- eigu Language Teaching and Research Press, 2000.
4Brown, G., Yule, G.. Discourse Analysis [ M ]. Cambridge : Cambridge University Press, 1983.
5DeVito, J.A. Psychogrammatical Factors in Oral and Written Discourse by Skilled Communicators [J]. Speech Mono- graphs, 1966,33( 1 ) : 73-76.
6Hyland, K. Teaching and Researching Writing[M]. Harlow, England: Longtnan, 2002.
7Halliday, M. A. K.,Martin, J. R. Writing science: Literacy and Discursive power[ M]. London : Falmer Press, 1993.
8Hyland, K. Academic Attribution: Citation and the Con- struction of Disciplinary Knowledge[J 1. Applied Linguistics, 1999,20(3):341 - 367.
9Hyland, K. Nurturing Hedges in the ESP Curriculum [J]. System, 1996,24(4) : 477 - 490.
10Swales, J. M., Ahmad, U. K., Chang,Y. Y.,Chavez,D., )ressen, D. F.,Seymour,R. Consider this: the Role of Im-peratives in Scholarly Writing [J]. Applied Linguistics, 1998,19(1 ): 97 - 12l.
二级参考文献3
1Robert D,Gautheir E,Ippersiel MP.The State of Nanotechnology Research:Report to the National Research Council of Canada[R].1997,5