3Auwnght,D,ls Class Size a Problem? [R]. Leeds: Lancaster-Leeds Language Learning in Large Class Research Project: Project Report No,3,1989 ( ERIC Document Reproduction Service No. ED322754).
4Bennett, S. New Dimensions in Research on Class Size and Academie Achievement[ R ]. National Center on Effectiue Secondary Schools, Vniversity of Wisconsin at Madison, 1987 ( ERIC Document Reproduction Service No. ED288854).
5Coleman, H. Learning and Teaching in Large Classes:A Bibliography [ R]. Leeds: Lain:aster-Leeds Language Learning in Large Class Research Project:Project Report No. 1. 1989a( ERIC Document Reproduction Service No. ED335911 ).
6Coleman, H. The Study of Large Classes [R]. Leeds : Lancaster-Leeds Language Learning in Large Classes Research Project:Project Report No. 2. 1989b( ERIC Document Reproduction Service No. ED322751 ).
7Ellis, R. Learning A Second Language Through Interaction [ M ]. John Benjamins B. V, 1999.