4Fulton, K. P. Time for Learning: Top 10 reasons why flipping the classroom can change Education[M].Thousand Oaks, CA:C or win, A SAGE Company,2014,32(6):123-125.
5Grabinger,R'S,J.C.Dunlap.Rich environments for active learn- ing: adefinition [J].Association for Learnig TechnologyJoumal, 1995,28(2) :30-34.