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摘要 5-6
Abstract 6
1 Introduction 9-13
    1.1 Research background of the study 9-11
    1.2 Purpose and significance of the study 11
    1.3 Organization of the thesis 11-13
2 Literature Review 13-29
    2.1 Definitions of lexical chunks 13-16
    2.2 Classification of lexical chunks 16-20
    2.3 Functions of lexical chunks 20-23
    2.4 Related empirical studies on lexical chunks 23-25
    2.5 Teaching approaches applying lexical chunks 25-29
        2.5.1 Lewis’ lexical approach 25-27
        2.5.2 Nattinger & DeCarrico’s teaching approach 27
        2.5.3 Summary 27-29
3 Methodology 29-31
    3.1 Research questions 29
    3.2 Subjects 29
    3.3 Instruments 29-30
    3.4 Procedures 30-31
4 Results and Discussions 31-36
    4.1 Overall features of lexical chunk used in prepared speeches 31
    4.2 Overall features of lexical chunks used in impromptu speeches 31-32
    4.3 Comparison of the features of lexical chunk used in prepared and impromptu speeche 32
    4.4 The diversity of the lexical chunks 32-34
    4.5 Discussion 34-36
        4.5.1 Overuse certain types of lexical chunks 34
        4.5.2 Colloquial expressions 34
        4.5.3 Lack of diversity 34-36
5 Pedagogical Implications 36-43
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