©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.[155]MODERNEDUCATIONSCIENCENo.3.2002GeneralNo.155[],,,:,;,;,;,[][],,(213001),,,,,[1],,,,,2080,,,,,,,[2],,,,,,,,,,,,,,:,,,,,,200012,,4201716%,1212%,818%,6114%,2615%,2316%[3],,,15©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:,,,,,,,,,,,,,,,,,,,(),,,,,,,,?,,:,,(),[4],:,,,,,,,,1P3,,,,,,,,,,,,,,,,,,,,(),,,,,,,,,,?,(),,,,,,,,,,,,,(25©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.)(),,,,,,,,,,,,,,,:21,:,,:,[5],,,,,:,,,,,(),20,,,,,,,,,,,,,,:,,;,,;,,,,,,,,,(),21,:,,:,[6],21,,,:,[7]:,:,,,,,,:[1].[N].,1996-10-11.[2].[A]..[C].,1999.117.[3].[J].,1998,(6).[4].[A]..[C].,1999.427.[5].[M].,1996.1.[6].[M].,1994.54[7]..[M].,1983.265.(:)35