Unit 1 In the library 1
Unit 2 Water sports 20
Unit 3 Make our world more beautiful! 35
Unit 4 Travel 53
Unit 5 Have a good time! 69
Unit 6 Mainly Revision 86
Unit 7 A man who never gave up 106
Unit 8 Merry Christmas! 121
Unit 9 What is it made of? 137
Unit 10 When was it built? 151
Unit 11 Planting trees 167
Unit 12 Mainly revision 182
Unit 13 The world s population 198
Unit 14 Shopping 215
Unit 15 A doctor for animals 230
Unit 16 The football match 246
Unit 17 The missing mecklace 261
Unit 18 Mainly Revision 276
参考答案 288