Unit 1 The Developing World
Topic 1 China has developed rapidly in recent years.
Topic 2 China has the largest population.
Topic 3 The world has changed for the better.
Unit 2 Saving the Earth
Topic 1 Pollution is harmful to people's health.
Topic 2 All these problems are very serious.
Topic 3 Would you like to be a greener person?
Unit 3 English Around the World
Topic 1 English is widely spoken throughout the world.
Topic 2 English is spoken differently in different countries.
Topic 3 Could you give us some advice on how to learn English well?
Unit 4 Amazing Science
Topic 1 Spaceships are mainly controlled by computers.
Topic 2 When was it invented?
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