Unit 1 The Big Move 1
Lesson 1 1
Lesson 2 3
Lesson 3 5
Lesson 4 7
Unit 1单元测试 9
Unit 2 It Smells Good 17
Lesson 1 17
Lesson 2 19
Lesson 3 21
Lesson 4 23
Unit 2单元测试 25
Unit 3 Never Give Up 33
Lesson 1 33
Lesson 2 35
Lesson 3 37
Lesson 4 39
Unit 3单元测试 41
Unit 4 Review 49
Lesson 1 49
Lesson 2 51
Lesson 3—Lesson 4 53
Unit 4单元测试 55
Unit 5 Postcards from the Palace 63
Lesson 1 63
Lesson 2 65
Lesson 3 67
Lesson 4 69
Unit 5单元测试 71
Unit 6 Silver and Gold 79
Lesson 1 79
Lesson 2 81
Lesson 3 83
Lesson 4 85
Unit 6单元测试 87
Unit 7 A Special Machine 95
Lesson 1 95
Lesson 2 97
Lesson 3 99
Lesson 4 101
Unit 7单元测试 103
Unit 8 Review 111
Lesson 1 111
Lesson 2 113
Lesson 3—Lesson 4 115
Unit 8单元测试 117
Unit 9 A Volunteer 125
Lesson 1 125
Lesson 2 127
Lesson 3 129
Lesson 4 132
Unit 9单元测试 134
Unit 10 Earth Day 142
Lesson 1 142
Lesson 2 144
Lesson 3 146
Lesson 4 148
Unit 10单元测试 150
Unit 11 The 3 R's 158
Lesson 1 158
Lesson 2 160
Lesson 3 162
Lesson 4 164
Unit 11单元测试 166
Unit 12 Review 174
Lesson 1 174
Lesson 2 176
Lesson 3—Lesson 4 178
Unit 12单元测试 180
参考答案 188