1[1]Atekinson J.W.An Introduction to Motivation,New Jersey:Van Nostrand,1964,p.214
2[2]Cathcart R and Olsen J.Teachers'and students'preferences for correction of classroom errors.Fanselow and Crymes(eds.).Washinton,DC:TESOL (Internet),1976.
3[3]Higgs T V & Clifford R.The push toward communication.In T V Higgs(ed.).Cuniculum,Competence and the Foreign Language Teacher.Skokie,Ⅲ:National Textbook Co.,1982.