目录Unit 1 In the library 1
Unit 2 Water sports 21
Unit 3 Make our world more beautiful！ 44
Unit 4 Travel 64
Unit 5 Have a good time ！ 83
Unit 6 Mainly revision 101
Unit 7 A man who never gave up 120
Unit 8 Merry Christmas！ 139
Unit 9 What is it made of？ 158
Unit 10 When was it built？ 177
Unit 11 Planting trees 194
Unit 12 Mainly revision 212
Unit 13 The world’s population 231
Unit 14 Shopping 254
Unit 15 A doctor for animals 273
Unit 16 The football match 292
Unit 17 The missing necklace 310
Unit 18 Mainly revision 329