毕业论文（设计）AcknowledgementsI would like to express my thanks and appreciation to all myteachers in the Foreign Language Department and those who helpedme during the writing of this thesis.A special acknowledgementshould be given to my tutor,Ms Zheng Sanliang,whose carefulreading and suggestions have been invaluable to me throughout mythesis writing.I am also indebted to my partners,roommates,andclassmates for their psychological support and encouragement.Finally,I wish to extend my thanks to the library assistants whosupplied me with reference materials of great value.i
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