Unit 1 In the library 1
Unit 2 Water sports 8
Unit 3 Make our world more beautiful 17
Unit 4 Travel 25
Unit 5 Have a good time 31
Unit 6 Mainly revision 38
Unit 7 A man who never gave up 46
Unit 8 Merry Christmas! 53
Unit 9 What is it made of? 61
Unit 10 When was it built? 68
Unit 11 Planting trees 75
Unit 12 Mainly revision 82
Unit 13 The world s population 89
Unit 14 Shopping 96
Unit 15 A doctor for animals 104
Unit 16 The football match 113
Unit 17 The missing necklace 121
Unit 18 Mainly revision 128
参考答案 135