Unit 1 The Developing World 1
Topic 1 Our country has developed rapidly 1
Topic 2 What a large population! 3
Topic 3 The world has changed for the better 5
Review of Unit 1 8
Unit 2 Loving Our Planet 10
Topic 1 Pollution causes too many problems 10
Topic 2 All these problems are very serious 12
Topic 3 Would you like to be a greener person? 15
Review of Unit 2 18
Review of Units 1-2 21
Unit 3 English Around the World 24
Topic 1 English is widely used throughout the world 24
Topic 2 English is spoken differently in different countries 26
Topic 3 Could you give us some advice on how to learn English well? 28
Review of Unit 3 31
Unit 4 Amazing Science 34
Topic 1 Spaceships are mainly controlled by computers 34
Topic 2 When was it developed? 36
Topic 3 We will live in space one day 39
Review of Unit 4 42
Review of Units 3-4 44
听力材料 47
参考答案 80