Unit1 In the library 1
Unit2 Water sports 14
Unit3 Make our world more beautiful 27
Unit4 Travel 39
Unit5 Have a good time 56
Unit6 Mainly revision 73
Unit7 A man who never gave up 89
Unit8 Merry Christmas 101
Unit9 What is it made of? 112
Unit10 When was it built? 124
Unit11 Planting trees 135
Unit12 Mainly revision 149
Unit13 The world s population 163
Unit14 Shopping 177
Unit15 A doctor for animals 191
Unit16 The football match 206
Unit17 The missing necklace 221
Unit18 Mainly revision 238
参考答案 255