2、ofChinaUndertheSupervisionofZhangSijieJune10,2016IVAcknowledgementsIn the process of the writing of this paper,myteacherZhangSijiedevoted a greatdeal ofeffortstomythesis, fromchoosingthetopictothethesisproposal,fromtheoutlinetothewholethesis,hepointed out
3、thespecificissues in themoverandoveragain, strictlyand persuasively. I express my sincerelythankstohim. Meanwhile, I would also like to thankmy teachers,classmatesandfriends, I was given great care and support inthetimeoffinishmythesis.Writingathesisisasys