1Danes, F. Functional Sentence Perspebtive and the Organization of the Text[M].1974.
2Gosden, l-l. Discourse Functions of Subject in Scientific Research irticles [J]. Applied Linguistics, 1993, (14).
3Fries, P.}t.A Personal View of Theme[A]. In M. Ghadessy (Ed.).Thematic Development in English Texts[C].London: Pinter, 1995.
4Swales J.M. 6enre analysis: English in Academic and Research Setting[M]. Rosa Lores, 2004.0n RA abstracts: from Rhetorical Structure to Thematic Organization [J].1990.