Chapter 1 Introduction
With the rapid development of economic globalization，more and more countries andregions are interrelated, world economy being combined into a total. As the largestdeveloping country, China continuously spares no effort to strengthen cross-bordercooperation and expand international exchanges to have better connection with worldeconomic organizations so as to promote the development of its economy. In thiscontinuing course of dealing, language is closely related to economic development. Thelink between them is especially reflected on the fact that language promotes economic andtrade cooperation. As the language tool in international economic and trade activities,business English can not be too important for international trade. And as a tool to conductinternational business communication as well as the bargaining chip to make successfuldeals, business conference speech, the object of the study, is an essential part of businessEnglish. Therefore, it is of great importance to have a study about business conferencespeeches to promote international economic, trade and cultural exchanges.The relevant business conferences hosted by various organizations have played animportant role in promoting economic growth, cooperation, trade and investment and theyprovide a good stage for different countries and regions to exchange ideas and thoughtswith the world. Study into business conference speeches has its practical significance asthe purpose of speeches in business conferences is to convey business information to orshare feelings with the audience by persuading, informing or entertaining them,I International economic organizations develop with the world economy and there arediverse international business conferences held by various economic organizations allthrough the year, among which APEC，WTO, and UNCTAD are inseparable from theeconomic development of China. Therefore, the research objects in this thesis are businessconference speeches selected from these three organizations.Not only businessmen have drawn their attention on these business conferencespeeches, linguists have also done relevant research and they have studied businessspeeches from diverse perspectives. Some scholars focused on the genre analysis ortranslation of business English speeches(Yang Weiwei，2007; Chen Zeze，2009; Wang Li，2009; Xiong Xiaohong, 2011)，others focused on them from the perspective ofmetaphor(Xu Bing, 2005; Jiang Xia, 2007) and still others study them from the point ofsystemic-functional grammar(Wang Yexuan, 2013). However, few studies were conductedfrom the perspective of presupposition.
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Chapter 2 Literature Review
2.1 Previous Studies on Business Conference Speeches
Business conference speeches, the research subject of this thesis, are reviewed in thissection. It is an important part of business speech, which falls into the category of publicspeaking, and public speaking plays an important role in transmitting information一persuading people to believe what speakers do； motivating people to take actions asproblem solutions or merely entertaining the audience. So, to know more or to masterpublic speaking is definitely important for our understanding of business conferencespeeches. Previous studies about public speaking are firstly introduced and then thedefinition，classification and features of effective business conference speeches arediscussed in detail. When it comes to the term "public speaking”，there are almost as many definitions asthere are books written to explain it. Byms(1997) gives his definition of public speaking,that is, "it is a deliberative type of communication", in which sense the speaker decides thegoals of a speech, prepares the intended messages and delivers the speech. Dance, FrankE. X.，Zak-Dance and Carol C. (1996) define that "public speaking is the activity of usingspoken language to communicate with many individuals at the same time". In this definition，it is the speakers who determine the desirable r
