8Little A. Multigrade teaching : towards an international research and policy agenda[ J]. Int J Educ Dev, 2001,21 (6) : 481 -497.
9Weiss DJ,Davis RV. Manual for the minnesota satisfaction ques- tionnaire[M]. Minneapolis MN: The University of Minnesota Press, 1967 : 1.
10Little A. Multigrade teaching: Towards an international research and policy agenda[J]. International Journal of Educational DeveI- opme.nt,2001,21 (6) :481 -497.