6Catford,J. C. Contrastive analysis and language teaching[C]// In J. E. Alatis(ed. ) Contrastive Linguistics and Its Pedagogical Implications. Report of the Nineteenth Annual Round Tahle Meeting on Linguistics and Language Studies, Washington D. C. :Georgetown University Press, 1968 : 159-173.
7Stockwell, Robert P. & J. Donald Bowen. The Sounds of Eng- lish and Spanish.[M]. Chicago: University of Chicago Press, 1965.
8Brown, H.D. Principles of Language Learning and Teaching [M]. LongmanInc. ,2000.
9Dupuy H J. The Rationale, Development and Standardization of a Basic Word Vocabulary Test[M]. Washington. C. : U. S. Government Printint Office.1974.
