7Izumi, S., Bigelow, M., Fujiwara, M. & Fearnow, S. Testing The Output Hypothesis: Effects of Output on Noticing and Second Language Acquisition [ J ]. Study of Second Language Acquisition, 1999, (21 ).
8Kinberg, M. Perspective on Foreign Language Immersion Programs[M].The Edwin Mellen Press, 2001.
9Larsen-Freeman, D. & Long, M. An Introduction to Second Language Acquisition Research [M].Beijing:Foreign language Teaching and Research Press, 2000.
