4[1]Brock, C.1986.The effects of referential questions on ESL cla ssroom discourse[J].TESOL Quarterly,20(1): 47~59.
5[2]Gardner, R.C.&P.D.MacIntyre.1993. On the measurement of affective variables in se cond language learning[J].Language Learning, 43,157~194.
6[3]Jackson. & H.Lahaderne.1967.Inequalities of teacher-pupil contacts[J].Psychol ogy in the Schools, 4:204~8.
7[4]Nunan, D.1991. Language teaching methodology[M].New York: Prentice Hall.
8[5]Oxford, R.L.1999.Anxiety and the language learner: new insights in Affect in Lan guage Learning[M].Cambridge University Press.
9[6]Rowe, M.1974.Wait-time and rewards as instructional variables, their influence o n language, logic and fate control: Part 1Wait time[J]. Journal of Resear ch on Science Teaching, 11:81~94.
10[7]Rowe, M.1986.Wait time: Slowing down may be a way of speeding up[J]. Journal of Teacher Education, 37:43~50.