7Krashen, S. The Input Hypothesis: Issues and Implications[M]. London: Longman, 1985.
8Paivio, A. Mental Representation: A Dual Coding Approach[M].Oxford, England: Oxford University Press, 1986.
9Gardner, R., Tremblay, F., Masgoret, A. Towards a Full Model of Second Language Learning: An Empirical Investigation [J]. The Modem Language Journal, 1997, 81 (3):344-362.
10Benson, V. Testing Made-for-ELT Videos[J]. The Language Teacher, 1993, 21 (9):15-19.
