[部优] Lesson 17 Save the Tigers_第一课时
[部优] Lesson 20 A Computer Helps!_第一课时
[部优] Lesson 18 Friendship Between Animals_第一课时
[部优] Lesson 9 Gardening with Mary_第一课时
[部优] Lesson 11 Amazing Plants_第一课时
[部优] Lesson 19 How Do You Use the Internet_第一课时
[部优] Lesson 29 How to Push a Product_第一课时
[部优] Lesson 33 2 800 Years of Sports_第一课时
[部优] Lesson 37 Let’s Learn Geography!_第一课时
[部优] Lesson 16 Happy Thanksgiving!
[部优] Lesson 3 Good Food, Good Health
[部优] Lesson 38 Hobbies Are Fun!_第一课时
[部优] Lesson 25 I Want to Be a Teacher!_第一课时
[部优] Lesson 2 Many Faces, One Picture_第一课时
[部优] Lesson 46 Getting Ready for Summer Holiday!_第一课时
[部优] Lesson 34 The Fisherman and the Goldfish ( II_第一课时
[部优] Lesson 30 Science Affects Us_第一课时
[部优] Lesson 58 Ms. Liu’s Speech_第一课时
[部优] Lesson 23 The Giant ( II )_第一课时
[部优] Lesson 21 The Fable of the Woodcutter_第一课时