Unit 1 I wrote a long letter 1
Unit 2 I usually look for cookies 5
Unit 3 How often do you go hiking？ 9
Unit 4 Review1 13
Unit 5 It’s a magic hat 17
Unit 6 The turtle is faster 21
Exercises for Unit1 to Unit6 25
Unit 7 He’s better than us 29
Unit 8 Review2 33
Unit 9 The green fish is the biggest 37
Unit 10 I want the best 41
Unit 11 Let’s go to the space 45
Unit 12 Review3 49
Culture1 and Culture2 53
综合测试（一） 57
综合测试（二） 61
参考答案 65