seed learning成立的目的是为21世纪的英语学习者提供最优质的语言学习产品和服务，以开发符合英语学习者需求的资源。

Unit 1 Going to School . 4
Unit 2 How Many Hearts? . 8
Unit 3 Useful Yellow . 12
Unit 4 Tree Homes . 16
Unit 5 Swimming . 20
Unit 6 July . 24
Unit 7 Do You Like It? . 28
Unit 8 Painting . 32
Review 1 . 36
Unit 9 Two, Four, Six, More! . 40
Unit 10 Where Are You From? . 44
Unit 11 Play It . 48
Unit 12 My Book Bag . 52
Unit 13 English Here and There . 56
Unit 14 Eyes . 60
Unit 15 Star Pictures . 64
Unit 16 Sweet Fruit . 68
Review 2 . 72