9Alanen R. Input enhancement and rule presentation in second language acquisition. In R. Rhmidt. Attention and awareness in foreign language learning [ M ]. University of Hawaii Press, 1995.
10Beccue B. , Vila J & Whitley L. K. The effects of adding audio instructions to a multimedia computer based training environment[J]. Journal of Educational Multimedia and Hypermedia,2001,10 ( 1 ).
