1、 Introduction

This article introduces the importance of business Chinese listening and speaking textbooks and the necessity of research. It analyzes the readability of three advanced business Chinese listening and speaking textbooks published after 2000 and explores the principles of writing specialized Chinese textbooks based on the "5C standard". At the same time, the specific content of the "5C standard" was elaborated, including five aspects: communication, culture, connection, comparison, and community, emphasizing the cultivation of learners' subjective initiative and communication skills. Finally, based on the "5C standard", analyze the characteristics of the textbook in terms of writing style, topic setting, listening corpus, and exercise design, and provide suggestions for textbook writing.

2、 Writing style

A detailed analysis was conducted on the writing style of three advanced business Chinese listening and speaking textbooks, including commonalities such as new vocabulary, post listening exercises, and comprehensive exercises, as well as differences in topic warm-up, pre listening training, and language point exercises for listening materials. Table 1 shows the specific situation of three textbook writing styles. Topic warm-up helps learners understand relevant content and enter a learning state. New vocabulary, language points, and pre listening training help learners prepare and focus on key points. Post listening exercises and comprehensive exercises are the main parts of the textbook, which directly obtain information through listening materials and then express it orally. Comprehensive exercises cover listening, speaking, reading, and writing exercises. At the same time, the "5C" standard examined the communicative, cultural, relational, comparative, and community-based aspects of the textbook. All three textbooks have chosen Chinese cultural themes, such as the "Holiday Economy" unit in "New Business" and the "Management and Chinese Culture" topic in "Listening and Speaking Tutorial". Warm up topics, language point learning, pre listening training, and reading materials all help learners establish a connection with the listening corpus. All three textbooks focus on selecting listening materials around topics, conducting listening and speaking exercises and comprehensive exercises to help learners apply what they have learned. But none of the three textbooks include specialized language comparison and cultural project comparison.

3、 Topic setting

An analysis was conducted on the topic settings of three advanced business Chinese listening and speaking textbooks using the "5C standard". Firstly, the number of topics in the three textbooks was counted, and it was found that a total of 7 topics were selected, including culture, investigation, negotiation, etc. It was also pointed out that "national economy" was a newly added topic. Subsequently, the topic setting was examined from five aspects: communicative, cultural, relational, comparative, and community-based. In terms of communicability, the impact of topic types, difficulty, and demand on cultivating learners' language communication skills was analyzed; In terms of cultural aspects, the knowledge culture and communication culture involved in the textbook were discussed; In terms of connectivity, the correlation between topics and their impact on the reproduction of knowledge points were examined; In terms of comparability, emphasis is placed on cultivating cultural sensitivity; In terms of community, we analyzed whether the topic can arouse learners' interest and promote their correct use of language in business communication. Finally, the comparison results of the difficulty level, demand level, and cultural topic proportion of the three textbooks in topic setting were presented in the form of a table.

4、 Listening corpus

Analyzed the listening corpus design of three advanced business Chinese listening and speaking textbooks, including corpus length, number of new words, and recording. The proportion of ultra long language materials in "New Business" is the highest, followed by phrase materials, while "Listening and Speaking" and "Listening and Speaking Tutorial" mainly use short language materials. In terms of the number of new words, it is optimal for each corpus to have no more than 11 new words. The recording reading method and speed are important for learners, and the recording speed of the three textbooks is generally between 160-200 words per minute. At the same time, the communicative, cultural, relational, comparative, and community-based aspects of the corpus were examined from the perspective of the "5C" standard. New Business performs well in terms of cultural elements, topic connections, and communicative context, while Listening and Speaking and Listening and Speaking Tutorial have some shortcomings in certain aspects.

5、 Practice Design

Analyzed the practice design of three advanced business Chinese listening and speaking textbooks, including question types and quantities, "5C" assessment of communicative, cultural, relational, comparative, and community-based aspects. There are various types of oral practice questions, including answering questions, expressing opinions, and situational performances, while there are fewer types of listening exercises and combined listening and speaking exercises. The "Listening and Speaking Tutorial" has the most practice questions, with an average of 39 per unit, followed by "New Business" with 13, and finally "Listening and Speaking" with 12. The communicative nature of the exercises in the three textbooks is ranked from strong to weak as "Listening and Speaking", "New Business", and "Listening and Speaking Tutorial". In terms of cultural aspects, "New Business" performs the best, followed by "Listening and Speaking", while "Listening and Speaking Tutorial" is relatively weak. In terms of connectivity, the listening and speaking training of the three textbooks all revolve around the same topic, among which the "Listening and Speaking Tutorial" combines listening and speaking more closely. In terms of comparability, "New Business" and "Listening and Speaking Tutorial" have set up more comparative question types. In terms of community, the exercises for "New Business" and "Listening and Speaking" are limited to the classroom or campus, while the exercises for "Listening and Speaking Tutorial" have stronger authenticity.

6、 Conclusion and Writing Suggestions

A comprehensive analysis was conducted on three advanced business Chinese listening and speaking textbooks, and the following conclusions were drawn: the textbooks reflect strong connectivity, communicability, culturality, comparability, and community in terms of writing style, topic setting, listening corpus, and exercise design. In terms of writing style, the textbook includes multiple sections, but lacks a section on cultural comparison; Topic setting focuses on the needs of learners, with negotiation topics being the main focus and cultural topics being less common; The listening corpus is mainly composed of short stories, with a moderate amount of new vocabulary, and the content and recording methods reflect a community oriented approach; In the practice design, there are a variety of oral practice questions, with a moderate amount of questions and emphasis on communicative and cultural elements. Through t-test, it was found that there is a significant difference in the number of new words and oral practice questions in the textbook, while there is no significant difference in the number of topics and practice questions.