4Brown, H. Principles of Language Learning and Teaching(3^rd edition) [ M ]. Beijing: Foreign Language Teaching and Learning Press, 2002.
5Dagut, M. & B. Laufer. Avoidance of phrasal verbs a case for contrastive analysis [ J ]. Studies in Second Language Acquisition, 1985 (7).
6Ellis, R. The Study of Second Language Acquisition [ M ]. Shanghai :Shanghai Foreign Language Education Press, 1999a.
7Ellis, R. Understanding Second Language Acquisition [ M ]. Shanghai: Shanghai Foreign Language Education Press, 1999b.
8Faerch, C. & G. Kasper. Two ways of defining communication strategies[J]. Language Learning, 1984(34).
9Hulstijn, J. & E. Marchena. Avoidance: Grammatical or semantic causes [ J ]. Studies in Second Language Acquisition, 1989 ( 11 ).
10Jack C. Richards, John Platt & Heidi Platt. Longman Dictionary of Language Teaching and Applied Linguistics[Z]. Beijing: Foreign Language Teaching and Research Press, 2000.
