《21世纪大学英语》（S版）系列教材（第3版）根据国家教育部颁发的《大学英语教学指南》（2020版）和《中国英语能力等级量表》以及我国高等院校人才培养特点和教学改革的最新成果编写而成，突出教育必须立德树人的时代要求，重视教学内容的实用性和针对性，在帮助学生培养正确的世界观、人生观和价值观的同时，将语言基础能力的培养与实际涉外交际能力的训练有机地结合起来，以满足新时代社会经济发展对大学生的要求。
本系列核心教材包括《综合教程》《综合练习》《教学参考书》（每一种分为1－4册）及配套的MP3、微课、助教PPT课件、“i学”App移动平台网络课程、超星“学习通”App示范教学包等。本套教材供高等院校普通英语教学使用。
本书为《教学参考书》第2册，共8个单元，每个单元根据《综合教程》的相关内容配备教法推荐、作者介绍、背景知识、课文详解以及练习答案和录音文本等。同时，本书在版式设计上力求易用（User-friendly），将学生用书的内容完整地融入教学参考书，课文讲解采用“左学右教”的方式，以方便教师教学。本书另配有PPT助教课件。

Unit 1 Pros and Cons of AJ
I.Objectives
Ⅱ.Suggested Teaching Plan
Ⅲ.Background Information
Ⅳ.Class Presentation
Lead-in
Listening
Reading
Text A: Thinking for Themselves
Text B: Artificial Intelligence as a Threat
Speaking
Translation & Writing （Résumé Cover Letters）
Critical Thinking
Time to Relax
Unit 2 Medical Jnnovations
I.Objectives
Ⅱ.Suggested Teaching Plan
Ⅲ.Background Information
IV.Class Presentation
Lead-in
Listening
Reading
Text A: Growing New Organs
Text B: Medical Robots
Speaking
Translation & Writing （Résumés）
Critical Thinking
Time to Relax
Unit 3 Toch Advances
I.Objectives
Ⅱ.Suggested Teaching Plan
Ⅲ.Background Information
IV.Class Presentation
Lead-in
Listening
Reading
Text A: Pros and Cons of Eating GMOs
Text B: Solar Energy
Speaking
Translation & Writing （Letters of Accepting/Declining an Offer）
Critical Thinking
Time to Relax
Unit 4 Jnspirations
I.Objectives
Ⅱ.Suggested Teaching Plan
Ⅲ.Background Information
IV.Class Presentation
Lead-in
Listening
Reading
Text A: A Teacher's Story
Text B: Follow Your Dream
Speaking
Translation & Writing （Introduction Letters）
Critical Thinking
Time to Relax
Unit 5 Tachling Problems
I.Objectives
Ⅱ.Suggested Teaching Plan
Ⅲ.Background Information
Ⅳ.Class Presentation
Lead-in
Listening
Reading
Text A: "Impossible" or "I'm Possible"
Text B: Nothing But Problems
Speaking
Translation & Writing （Inquiry Letters）
Critical Thinking
Time to Relax
Unit 6 Medical emergency
I.Objectives
Ⅱ.Suggested Teaching Plan
Ⅲ.Background Information
IV.Class Presentation
Lead-in
Listening
Reading
Text A: What Is a Medical Emergency？
Text B: The Story of a Teen EMT
Speaking
Translation & Writing （Replies to Inquiry Letters）
Critical Thinking
Time to Relax
Unit 7 Career
I.Objectives
Ⅱ.Suggested Teaching Plan
Ⅲ.Background Information
Ⅳ.Class Presentation
Lead-in
Listening
Reading
Text A: Follow Your Passions to a Career
Text B: Is a Part-time Job Right for You？
Speaking
Translation & Writing （Complaint Letters）
Critical Thinking
Time to Relax
Unit 8 Jnterpersonal Rolationships
I.Objectives
Ⅱ.Suggested Teaching Plan
Ⅲ.Background Information
Ⅳ.Class Presentation
Lead-in
Listening
Reading
Text A: Criticism: Don't Take It Personally
Text B: Working With Difficult People
Speaking
Translation & Writing （Replies to Complaints）
Critical Thinking
Time to Relax
Grammar Review
I.Subject-verb Agreement
Ⅱ.Inversion
Ⅲ.The Infinitive and V-ing
IV.Use V-ing or Infinitive
V.V-ing Phrases, V-ed Phrases and To V Phrases Used as Adverbials
VI.Absolute Construction
VII.The Subjunctive Mood
VIII.EIlipsis
IX.Emphasis