Unit 1 Hobbies and Habits 爱好与习惯

Lesson 1 I Love Meeting New People. 我喜欢认识新朋友。

Lesson 2 Why Don’t We Go to the Movies? 为什么我们不去看电影呢？

Lesson 3 Everyone Has Some Bad Habits. 每个人都有坏习惯。

Lesson 4 I’ll Get Plenty of Sleep. 我会睡眠充足。

Unit 2 Human Biology 人体生物学

Lesson 5 Understanding Viruses 认识病毒

Lesson 6 Against Influenza 预防流感

Lesson 7 Bones 骨头

Lesson 8 To Take Care of Our Teeth 爱护牙齿

Unit 3 The Past 过去

Lesson 9 Years Ago… 多年前……

Lesson 10 My City Years Ago我的城市多年前……

Lesson 11 Life Was Different. 生活不同了。

Lesson 12 When Your Were Little… 当你小的时候……

Unit 4 Personality 个人性格

Lesson 13 She Is a Calm Person. 她是一个镇定的人。

Lesson 14 I Have Seen Her. 我见过她。

Lesson 15 Have You Traveled? 你有去过旅行吗？

Lesson 16 You’re Pretty Brave! 你非常勇敢！

Unit 5 At the Doctor 看医生

Lesson 17 I Had a Sore Throat. 我喉咙痛。

Lesson 18 Smoking Harms Your Body. 吸烟有害身体健康。

Lesson 19 To Stop Smoking 戒烟

Lesson 20 Take Care, Lucy! 露西，小心！

Unit 6 Tour 旅行

Lesson 21 Geographical Features 地理特征

Lesson 22 My Country, Ecuador 我的国家，厄瓜多尔

Lesson 23 How Long Has It Been Here? 它在那里多久了？

Lesson 24 Have We Missed the Tour? 我们错过了旅游时间吗？

Unit 7 The Olympics 奥林匹克运动会

Lesson 25 Did You know … ? 你知道……吗？

Lesson 26 We Have to Buy the Tickets. 我们需要买票。

Lesson 27 The Rules of Teen Olympics 青少年奥林匹克运动会规则

Lesson 28 Winter Olympics Underdogs 冬季奥运会输家

Unit 8 Environment Protecting 保护环境

Lesson 29 What Can We Recycle? 我们可以循环利用什么？

Lesson 30 I Guess I Forgot. 我应该忘了。

Lesson 31 Garbage Ends Up in Landfills. 垃圾最后去了填埋场。

Lesson 32 Problems Caused by Landfills 垃圾填埋场产生的问题

Unit 9 Advertisements 广告

Lesson 33 Personal Care Products 个人护理用品

Lesson 34 You Don’t Believe That, Do You? 你不相信对不对？

Lesson 35 Think Critically When You See an Ad. 看到广告时，要谨慎思考。

Lesson 36 Be “Ad Savvy.” 做个“广告通”

Unit 10 Bullying 学校欺凌

Lesson 37 Someone Teased Me. 有人取笑我。

Lesson 38 I Don’t Pick on Other Kids Anymore. 我不会再捉弄别的小孩了。

Lesson 39 Stop Cyberbullying! 停止网上欺凌

Lesson 40 I Didn’t Say Anything. 我什么都没说。

Unit 11 Crimes 犯罪

Lesson 41 Burglaries 入室抢劫

Lesson 42 My Sister Saw the Guy! 我姐姐看到了那个人！

Lesson 43 A Crime-prevention Flier 预防犯罪小传单

Lesson 44 Someone Stole My Phone! 有人偷了我的手机！

Unit 12 Festivals 节日

Lesson 45 Chinese Spring Festival 中国春节

Lesson 46 Day of the Dead 亡灵节

Lesson 47 The Festival of Colors 颜色的节日

Lesson 48 National Day 国庆节

Unit 13 Animals' Language 动物语言

Lesson 49 Animals Can Communicate. 动物会沟通交流。

Lesson 50 Communication of the Same Species 同物种的交流

Lesson 51 Communication of Different Species 物种间的交流

Lesson 52 Between Humans and Animals 人类与动物的交流

Unit 14 Languages 语言

Lesson 53 Codes 代码

Lesson 54 What Do We Use Languages for? 语言有什么用处？

Lesson 55 To Express Emotions by Sounds 用声音表达情感

Lesson 56 Unique Languages 独一无二的语言

Unit 15 Birds 鸟类

Lesson 57 Tool-Making Birds 制造工具的鸟

Lesson 58 Long-Distance Travelers 长途旅行者

Lesson 59 Show-offs 炫耀者

Lesson 60 Birdsongs 鸟歌