必修 第二册
Unit 4 Information technology
Lesson 1 Avatars
Lesson 2 Apps
Lesson 3 Internet and Friendships
Unit 5 Humans and nature
Lesson 1 A Sea Story
Lesson 2 Professional Rescue Team
Lesson 3 Race to the Pole
Unit 6 The admirable
Lesson 1 A Medical Pioneer
Lesson 2 History Makers
Lesson 3 The Superhero Behind Superman