Unit 1 The Developing World 1
Topic 1 Our country has developed rapidly 1
Topic 2 What a large population! 11
Topic 3 The world has changed for the better 21
单元整合评估 32
Unit 2 Loving Our Planet 35
Topic 1 Pollution causes too many problems 35
Topic 2 All these problems are very serious 45
Topic 3 Would you like to be a greener person? 55
单元整合评估 65
REVIEW 1 Review of Units 1-2 69
期中整合评估 73
Unit 3 English Around the World 77
Topic 1 English is widely used throughout the world 77
Topic 2 English is spoken differently in different countries 87
Topic 3 Could you give us some advice on how to learn English well? 99
单元整合评估 109
Unit 4 Amazing Science 113
Topic 1 Spaceships are mainly controlled by computers 113
Topic 2 When was it developed? 123
Topic 3 We will live in space one day 133
单元整合评估 143
REVIEW 2 Review of Units 3-4 146
期末整合评估 150
参考答案 154