2Beaudoin, M. The instructor's changing role in distance education [J]. The American Journal of Distance Education,1990,4(2) :21-29.
3Berge Z. Barriers To Online Teaching In Post-Secondary Institutions: Can Policy Changes Fix It [J]. Online Journal ofDistance Learning Administration, Volume I. Georgia: State University of West Georgia, Distance Education Center,1998.
4Gellman-Danley, B and Marie J. Fetzner. Asking the Really Tough Questions : "Policy Issues for Distance Learning [J].Online Journal of Distance Learning Administration, Volume 1. Georgia : State University of West Georgia, Distance Education Center, 1998.
5National Center for Education Statistics. Distance education at postsecondary education institutions[ R]. Available at http ://nces. ed.gov/pubs2002/coe2002/section5/indicator53.html.
6Taylor, J.C. and White, V.J. Faculty attitudes towards teaching in the distance education mode: An exploratory investigation[C]. Research in Distance Education, 1991.7 -11.
7Gardner,Howard,10th ed.Frames of Mind[M].Basic.Books,1993.
8Gu,Yueguo.From the classroom to distance to Intemet[Z].In Wenzhong Hu,ed,ELT in China 2001,《中国英语教学》(三)128—142.
9Romiszowski,A.J.2nd.The Selection and Use of Instruc.tional Media[M].London:Kogan Page.1988.