Unit 1 Teacher's Day 1
Unit 2 The sports meeting 14
Unit 3 A good teacher 28
Unit 4 What were they doing? 45
Unit 5 The accident 58
Unit 6 In the library 73
Unit 7 Mainly revision 91
Unit 8 On the farm 108
Unit 9 A visit to a factory 120
Unit 10 Mr Green's problem 133
Unit 11 A great inventor 148
Unit 12 Have a good time,Jim! 165
Unit 13 Merry Christmas! 182
Unit 14 Mainly revision 196
Unit 15 At home with the twins 212
Unit 16 What's it made of? 226
Unit 17 What was it used for? 239
Unit 18 Planting trees 253
Unit 19 Mainly revision 267
Unit 20 The world's populalion 277
Unit 21 Shopping 290
Unit 22 At the doctor's 300
Unit 23 The football match 311
Unit 24 Mainly revision 323
参考答案 334