科普版初中英语九年级上册 Unit 2 Saving the Earth Topic 3 What can we do at home to protect the environment Section C教学视频

科普版初中英语九年级上册 Unit 3 English Around the World Topic 1 English is widely spoken throughout the world Section D教学视频

科普版初中英语九年级上册Unit 1 The Changing World Topic 3 The world has changed for the better Section B教学视频

科普版初中英语九年级上册 Unit 4 Amazing Science Topic 1 When was it invented Section B教学视频

科普版初中英语九年级上册 Unit 4 Amazing Science Topic 1 When was it invented Section A教学视频

科普版初中英语九年级上册Unit 1 The Changing World Topic 1 Our country has developed rapidly Section A教学视频

科普版初中英语九年级上册Unit 1 The Changing World Topic 2 The population in developing countries is growing faster Section C教学视频

科普版初中英语九年级上册 Unit 2 Saving the Earth Topic 2 All these problems are very serious Section D教学视频

科普版初中英语九年级上册 Unit 3 English Around the World Topic 3 Could you give us some advice on how to learn English well Section A教学视频

科普版初中英语九年级上册 Unit 4 Amazing Science Topic 2 I'm excited about the things that will be discovered in the future Section D教学视频