提示：点击单元就可开始单词学习：
- Module 1 My life
- Unit 1:Encyclopaedias
- Unit 2:Numbers
- Module 2 The natural world
- Unit 3:Computers
- Unit 4:Inventions
- Module 3 Travels
- Unit 5:Educational exchanges
- Unit 6:Ancient stories
- Module 4 Fun time
- Unit 7:Memory
- Unit 8:English week