Book 4 單字本

1. Unit 1 · Where Are We in the Universe? (Bella's Home)
2. Unit 2 · Traveling Together Around the Sun
3. Unit 3 · Discovering the Past — Hidden Army
4. Unit 4 · Discovering the Past — Stumbling on the Past
5. Unit 5 · Where Does Our Food Come From?
6. Unit 6 · Food and Farming
7. Unit 7 · Art and Artists
8. Unit 8 · Sketches in a Gallery
9. Unit 9 · A Big-City Snapshot (Jakarta)
10. Unit 10 · Mayor for a Day
11. Unit 11 · How Do Our Bodies Fight Disease?
12. Unit 12 · Our Body Systems
13. Unit 13 · What Is the Mass Media?
14. Unit 14 · What Are Some Brave Things People Do?
15. Unit 15 · Forces of Nature
16. Unit 16 · Staying Calm Before the Storm
17. Unit 17 · Why Are Biomes Important?
18. Unit 18 · Camila's Journey (Coral Reefs)