3Newmark,L.How not to Interfere with Language Learning (1966)[A].The Communicative Approach to Language Teaching[C].Ed. C.J.Brumfit and K.Johnson. London: Oxford University Pres,1979.
4Krashen,S.Accounting for Child-adult Differences in Second Language ate and Attainment[A]. In Krashen,S.,.Scarcella,and M. Long.(eds.)Child - adult Differencesin Second Language Acquisition[C]. Rowley, Mass. ;Newbury House,1982.