6Brinton D M, Snow M A & Wesche M B. Content-based Second Language Instruction [M]. Boston : Heinle & Heinle, 1989.
7Bruner J. The act of discovery [J]. Harvard Educational Review, 1961, (31 ) : 21 - 32.
8Cummins J. Immersion education for the millennium: What we have learned from 30 years of research in language immersion [EB/OL]. http ://www. iteachilearn, com/cummins/immersion2000, html, 2000.
9Dewey J. Experience and Education [M]. New York: Collier Books, 1963. 89 -91.
10Krashen S. Principles and Practice in Second Language Acquisition [ M]. Oxford: Pergamon, 1982.
