7Wood, D., Bmner, J. S., & Ross, G. The role of tutoring in problem solving [J]. Journal of Child Psychology and Psychiatry, 1976 (17): 89-100.
8Norris, S. Analyzing Multimodal Interaction: A Methodological Framework [M]. London: Routledge, 2004.
9Cazden, C. B. Classroom Discourse: The Language of Teaching and Learning [M]. Portsmouth: Heinemann, 2001.
10Aljaafreh, A., & Lantolf, J. P. Negative feedback as regulation and second language learning in the zone of proximal development [J]. Modern Language Journal, 1994,78:465-487.
