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Submitted on: 16 June 2014.
Revised on: 23 August 2014.
Accepted on: 04 September 2014.
___________________Environmental Education Research
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http://reply.papertrans.cn/1/87/8614/8614-34.png
http://reply.papertrans.cn/1/87/8614/8614-35.png
Submitted on: 11 August 2007.
Revised on: 18 November 2007.
Accepted on: 28 November 2007.
___________________Environmental Education Research