Submitted on: 17 August 2004.
Revised on: 08 September 2004.
Accepted on: 18 September 2004.
Psychology Learning and Teaching-PLAT
Submitted on: 30 June 1999.
Revised on: 08 August 1999.
Accepted on: 24 August 1999.
Psychology Learning and Teaching-PLAT
Submitted on: 31 October 2005.
Revised on: 28 November 2005.
Accepted on: 11 December 2005.
Psychology Learning and Teaching-PLAT
http://reply.papertrans.cn/3/257/25670/25670-24.png
http://reply.papertrans.cn/3/257/25670/25670-25.png
http://reply.papertrans.cn/3/257/25670/25670-26.png
http://reply.papertrans.cn/3/257/25670/25670-27.png
Submitted on: 19 July 1998.
Revised on: 10 August 1998.
Accepted on: 29 August 1998.
Psychology Learning and Teaching-PLAT
http://reply.papertrans.cn/3/257/25670/25670-29.png
http://reply.papertrans.cn/3/257/25670/25670-30.png