《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，突出教学内容的实用性和针对性，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《综合教程》第2册，共8个单元，每个单元由导入、听、读、说、译和写、思辨以及轻松时刻等内容组成。导入（Lead-in）通过视频和相关练习引入话题并对整个单元作总体介绍，帮助学生了解本单元学习任务，激发学习兴趣。听（Listening）和说（Speaking）部分围绕每单元的主题，并结合大学生学习生活和毕业后工作的实际需要，进行听力与口语方面的专门训练。阅读板块包括Text A（精读）和Text B（泛读），并配有相应的练习。译（Translation）和写（Practical Writing）部分根据我国高等教育发展的特点和实际需求，提供以强化实用技能和素质为目标的实用训练。思辨（Critical Thinking）选取权威媒体资料，配以练习，旨在帮助学生树立正确的人生观和价值观，激发其创造力，增强思辨能力。本书最后还附有Grammar Review及相关练习，帮助学生复习和巩固语法知识。

UNIT 1 Pros and Cons of AI
Part I Lead-in
Part II Listening
Part III Reading
Text A: Thinking for Themselves
Text B: Artificial Intelligence as a Threat
Part IV Speaking
Part V Translation & Writing (Resume Cover Letters)
Part VI Critical Thinking
Part VII Time to Relax
UNIT 2 Medical Innovations
Part I Lead-in
Part II Listening
Part III Reading
Text A: Growing New Organs
Text B: Medical Robots
Part IV Speaking
Part V Translation & Writing (Resumes)
Part VI Critical Thinking
Part VII Time to Relax
UNIT 3 Tech Advances
Part I Lead-in
Part II Listening
Part III Reading
Text A: Pros and Cons of Eating GMOs
Text B: Solar Energy
Part IV Speaking
Part V Translation & Writing (Letters of Accepting/Declining an Offer)
Part VI Critical Thinking
Part VII Time to Relax
UNIT 4 Inspirations
Part I Lead-in
Part II Listening
Part III Reading
Text A: A Teacher's Story
Text B: Follow Your Dream
Part IV Speaking
Part V Translation & Writing(Introduction Letters)
Part VI Critical Thinking
Part VII Time to Relax
UNIT 5 Tacklina Problems
Part I Lead-in
Part II Listening
Part III Reading
Text A: "Impossible" or I'm Possible"
Text B: Nothing But Problems
Part IV Speaking
Part V Translation & Writing (Inquiry Letters)
Part VI Critical Thinking
Part VII Time to Relax
UNIT 6 Medical Emergency
Part I Lead-in
Part II Listening
Part III Reading
Text A: What Is a Medical Emergency?
Text B: The Story of a Teen EMT
Part IV Speaking
Part V Translation & Writing (Replies to Inquiry Letters)
Part VI Critical Thinking
Part VII Time to Relax
UNIT 7 Career
Part I Lead-in
Part II Listening
Part III Reading
Text A: Follow Your Passions to a Career
Text B: Is a Part-time Job Right for You?
Part IV Speaking
Part V Translation & Writing (Complaint Letters)
Part VI Critical Thinking
Part VII Time to Relax
UNIT 8 Interpersonal Relationships
Part I Lead-in
Part II Listening
Part III Reading
Text A: Criticism: Don't Take It Personally
Text B: Working With Difficult People
Part IV Speaking
Part V Translation & Writing (Replies to Complaints)
Part VI Critical Thinking
Part VII Time to Relax
Grammar Review
I 主谓一致
Ⅱ 倒装
ⅢI 动词不定式和动词-ing
IⅣ 动词-ing与不定式的用法比较
V V-ing,V-ed和ToV短语作状语
ⅥI 独立结构
VI 虚拟语气
VI 省略
IX 强调
Glossary