8Bax S. CALL -- Past, present and future [ J]. System, 2003, 31 ( 1 ).
9Chapelle C. Computer Applications in Second Language Acquisition : Foundations for Teaching, Testing and Research [ M ]. Cambridge, UK : Cambridge University Press, 2001.
10Chun D M. L2 reading on the web: Strategies for accessing information in hypermedia [ J]. CALL, 2001, 14 (5): 367-403.