http://reply.papertrans.cn/1/87/8613/8613-31.png
http://reply.papertrans.cn/1/87/8613/8613-32.png
http://reply.papertrans.cn/1/87/8613/8613-33.png
http://reply.papertrans.cn/1/87/8613/8613-34.png
http://reply.papertrans.cn/1/87/8613/8613-35.png
Submitted on: 17 September 2006.
Revised on: 26 December 2006.
Accepted on: 25 January 2007.
___________________Environmental Education Research