7Mayer F. Educational Psychology: A CognitiveApproach. Boston : Little Brown. , 1987,34 -- 3.
8Gagne Ro M. The base of Education Technology (in Chinese). Beijing :Education Science Publishing House, 1992. 27.
9Ausubel D. P. The Use of Advance Organizer in the Learning And Retention of Meaningful Verbal Material. Journal of Educational Psychology, 1960,51 : 267-272.
10Rogers C. R. Freedom to Learn (3rd ed. )Ohiol: Merrill,1983.
