Unit 1 In the library 1
Unit 2 Water sports 19
Unit 3 Make ourworldmore beautiful! 33
Unit 4 Travel 46
Unit 5 Have a good time! 61
Unit 6 Mainly revision 75
Unit 7 A man who never gave up 91
Unit 8 Merry Christmas! 107
Unit 9 What is it made of? 124
Unit 10 When was it built? 138
Unit 11 Planting trees 152
Unit 12 Mainly revision 167
Unit 13 The world's population 181
Unit 14 Shopping 197
Unit 15 A doctor for animals 213
Unit 16 The football match 227
Unit 17 The missing necklace 242
Unit 18 Mainly revision 255
参考答案 270