Unit 1 Teachers’ Day 1
Unit 2 The sports meeting 12
Unit 3 A good teacher 23
Unit 4 What were they doing？ 36
Unit 5 The accident 48
Unit 6 In the library 60
Unit 7 Mainly revision 72
期中综合练习（Unit 1—Unit 7） 83
Unit 8 On the farm 91
Unit 9 A visit to a factory 103
Unit 10 Mr Green’s problem 115
Unit 11 A great inventor 128
Unit 12 Have a good time ，Jim！ 141
Unit 13 Merry Christmas！ 154
Unit 14 Mainly revision 166
期末综合练习（Unit 1—Unit 14） 176
Unit 15 At home with the twins 183
Unit 16 What’s it made of？ 196
Unit 17 What was it used for？ 209
Unit 18 Planting trees 223
Unit 19 Mainly revision 237
期中综合练习（Unit 15—Unit 19） 249
Unit 20 The world’s population 259
Unit 21 Shopping 272
Unit 22 At the doctor’s 288
Unit 23 The football match 301
Unit 24 Mainly revision 315
期末综合练习（Unit 15—Unit 24） 326
参考答案 333