仁爱英语 Unit 1 Topic 1 Our country has developed rapidly. Topic 2 The population in developing countries is growing faster. Topic 3 The world has changed for the better. Review of Unit 1 Unit 2 Topic 1 Pollution has caused too many problems. Topic 2 All these problems are very serious. Topic 3 What can we do at home to protect the environment? Review of Units 1-2 Unit 3 Topic 1 English is widely spoken throughout the world. Topic2 Some things usually have different meanings in different cultures. Topic 3 Could you give us some advice on how to learn English well? Review of Unit 3 Unit 4Topic 1 When was it invented? Topic2 I'm excited about the things that will be discovered in the future. Topic 3 China is the third nation that sent a person into space. Review of Units 3-4 1
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