Unit 1 In the library 1
Lesson 1 3
Lesson 2 6
Lesson 3 11
Lesson 4 13
单元总结 16
Unit 2 Watersports 18
Lesson 5 20
Lesson 6 23
Lesson 7 30
Lesson 8 32
单元总结 38
Unit 3 Make our World more beautiful！ 41
Lesson 9 43
Lesson 10 45
Lesson 11 50
Lesson 12 52
单元总结 55
Unit 4 Travel 58
Lesson 13 60
Lesson 14 63
Lesson 15 68
Lesson 16 72
单元总结 74
Unit 5 Have a good time！ 77
Lesson 17 79
Lesson 18 84
Lesson 19 88
Lesson 20 92
单元总结 98
Unit 6 Mainly revision 101
Lesson 21 103
Lesson 22 108
Lesson 23 114
Lesson 24 117
单元总结 123
Unit 7 A man who never gave up 126
Lesson 25 128
Lesson 26 133
Lesson 27 144
Lesson 28 145
单元总结 151
Unit 8 Merry Christmas！ 154
Lesson 29 156
Lesson 30 162
Lesson 31 168
Lesson 32 171
单元总结 177
Unit 9 What is it made of？ 180
Lesson 33 182
Lesson 34 185
Lesson 35 191
Lesson 36 192
单元总结 194
Unit 10 When was it built？ 197
Lesson 37 199
Lesson 38 201
Lesson 39 206
Lesson 40 207
单元总结 211
Unit 11 Planting trees 214
Lesson 41 216
Lesson 42 220
Lesson 43 224
Lesson 44 226
单元总结 230
Unit 12 Mainly revision 232
Lesson 45 233
Lesson 46 235
Lesson 47 239
Lesson 48 240
单元总结 243