Unit1 In the library 1
Unit2 Water sports 18
Unit3 Make our world more beautiful 36
Unit4 Travel 52
Unit5 Have a good time! 68
Unit6 Mainly revision 83
Unit7 A man who never gave up 97
Unit8 Merry Christmas! 111
Unit9 What is it made of? 124
复习题（Ⅰ） 138
Unit10 When was it built? 145
Unit11 Planting trees 160
Unit12 Mainly revision 172
Unit13 The world s population 184
Unit14 Shopping 197
Unit15 A doctor for animals 208
Unit16 The football match 220
Unit17 The missing necklace 232
Unit18 Mainly revision 244
复习题（Ⅱ） 256
参考答案 261