3Swain, M. Input in Second Language Acquisition [M]. Mass: Newbury House, 1985.
4Rumelhart, D. E. Schemata : the building blocks of cognition. In R. J. Spiro. B. C. Bruce, and W. E. Rrewer ( eds. ). Theoretical Issues in Reading Comprehension. Hillsdale [ Z ]. NJ: Lawrence ErlbaumAssociates, 1980.
5Halliday, M. A. K. & R. Hasan. Cohesion in English [ M]. London: Longman, 1976.
6Beaugrande, R. de & W. Dressler. Introduction to Text linguistics [ M ]. London & New York: kongman, 1981.
7Hoey, M. On the Surface of Discourse [M]. London: George Allen & Unwin, 1983.
8Halliday, M.A.K. & Hasan, R. Cohesion in English[M].北京:外语教学与研究出版社,2001.
9Visotsky, L. Mind and Society [ M]. Cambridge, MA: Harvard University Press, 1978.
10Nunan,D. Second language teahing and learning[ M]. Boston: Heinle & Heinle, 1999.