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- 23:01 免费1、Unit1 Topic1 Our country has ...
- 26:11 付费2、Unit1 Topic1 Our country has ...
- 24:52 付费3、Unit1 Topic1 Our country has ...
- 26:21 付费4、Unit1 Topic1 Our country has ...
- 17:51 付费5、Unit1 Topic2 The population ...
- 25:21 付费6、Unit1 Topic2 The population ...
- 18:54 付费7、Unit1 Topic2 The population ...
- 25:17 付费8、Unit1 Topic2 The population ...
- 26:35 付费9、Unit1 Topic3 The world has c ...
- 23:12 付费10、Unit1 Topic3 The world has ...
- 25:57 付费11、Unit1 Topic3 The world has ...
- 21:57 付费12、Unit1 Topic3 The world has ...
- 19:00 付费13、Unit2 Topic1 Pollution has ...
- 22:47 付费14、Unit2 Topic1 Pollution has ...
- 26:13 付费15、Unit2 Topic1 Pollution has ...
- 24:08 付费16、Unit2 Topic1 Pollution has ...
- 18:09 付费17、Unit2 Topic2 All these prob ...
- 17:06 付费18、Unit2 Topic2 All these prob ...
- 23:18 付费19、Unit2 Topic2 All these prob ...
- 27:25
付费20、Unit2 Topic2 All these prob ... - 00:00 付费21、Unit2 Topic3 What can we do ...
- 00:00 付费22、Unit2 Topic3 What can we do ...
- 00:00 付费23、Unit2 Topic3 What can we do ...
- 00:00 付费24、Unit2 Topic3 What can we do ...
- 00:00 付费25、Unit3 Topic1 English is wid ...
- 00:00 付费26、Unit3 Topic1 English is wid ...
- 00:00 付费27、Unit3 Topic1 English is wid ...
- 20:37 付费28、Unit3 Topic1 English is wid ...
- 00:00 付费29、Unit3 Topic2 Some things us ...
- 00:00 付费30、Unit3 Topic2 Some things us ...
- 00:00 付费31、Unit3 Topic2 Some things us ...
- 00:00 付费32、Unit3 Topic2 Some things us ...
- 00:00 付费33、Unit3 Topic3 Could you give ...
- 00:00 付费34、Unit3 Topic3 Could you give ...
- 00:00 付费35、Unit3 Topic3 Could you give ...
- 00:00 付费36、Unit3 Topic3 Could you give ...
- 00:00 付费37、Unit4 Topic1 When was it in ...
- 00:00 付费38、Unit4 Topic1 When was it in ...
- 00:00 付费39、Unit4 Topic1 When was it in ...
- 00:00 付费40、Unit4 Topic1 When was it in ...
- 00:00 付费41、Unit4 Topic2 I'm excited ab ...
- 00:00 付费42、Unit4 Topic2 I'm excited ab ...
- 00:00 付费43、Unit4 Topic2 I'm excited ab ...
- 00:00 付费44、Unit4 Topic2 I'm excited ab ...
- 00:00 付费45、Unit4 Topic3 China is the t ...
- 00:00 付费46、Unit4 Topic3 China is the t ...
- 00:00 付费47、Unit4 Topic3 China is the t ...
- 30:36 付费48、Unit4 Topic3 China is the t ...