5U.S. Department of Education . Effectiveness of Reading and Mathematics Software Products: Findings from the First Student Cohort [DB/OL ].http://ies.ed.gov/ncee/pdf/20074005.pdf , 2007.
7Liu, M. & Jackson, J. An exploration of Chinese EFL learners' unwillingness to communicate and foreign language anxiety[J]. Modem Language Journal, 2008, 92(1): 71-86.
8Yan, J. X.&Horwitz E. K. Learners' perceptions of how anxiety interacts with personal and instructional factors to influence their achievement in English: a qualitative analysis of EFL learners in China[J] .Language Learning,2008,58(1): 151 - 183.
9Liu, M. H. Reticence, anxiety and performance of Chinese university students in oral English lessons and tests[D]. Hong Kong: The Chinese University of Hong Kong, 2005.
10Norton, B. Identity and language learning: gender, ethnicity and educational change [M].Harlow, England: Pearson Education, 2000.
