3[1]Brown, G. &Yule, G. Discourse Analysis[M]. Cambridge: Cambridge University Press,1983.
4[2]Connor, Ulla. Contrastive Rhetoric: Cross-cultural Aspects of Second Language Writing[M]. Cambridge: Cambridge University Press, 1996.
5[3]Danes, Frantisek. Functional sentence perspective and the organization of the text[A]. Danes(ed). Papers in Functional Sentence Perspective, Prague[C]. Academia, 1974.
6[4]Ehrlich, S. Cohesive devices and discourse competence[J]. World Englishes,1988,7(2):111-118.
7[5]Firbas, J. On defining the theme in functional sentence analysis[J]. Travaux Linguistiques de Prague,1964(1).
8[6]Green et al. The incidence and effects on coherence of marked themes in Interlanguage texts: A corpus-based enquiry[J]. English for Specific Purposes,2000(19):99-113.
9[7]Halliday, M. A. K. & R. Hasan. Cohesion in English[M]. London: Longman, 1976.
10[8]Halliday, M. A. K. An Introduction to Functional Grammar (2nd ed.)[M]. Beijing: Foreige Language Teaching and Research Press, 2000.
