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- 00:00 免费1、Unit 1 Great explorations(1) ...
- 00:00 付费2、Unit 1 Great explorations(2) ...
- 00:00 付费3、Unit 2 Culture shock(1)
- 00:00 付费4、Unit 2 Culture shock(2)
- 00:00 付费5、Unit 3 The environment(1)
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付费6、Unit 3 The environment(2) - 00:00 付费7、Unit 4 Natural disasters(1)
- 00:00 付费8、Unit 4 Natural disasters(2)
- 00:00 付费9、Unit 5 Sport(1)
- 00:00 付费10、Unit 5 Sport(2)
- 00:00 付费11、Unit 6 Caring for your heal ...
- 00:00 付费12、Unit 6 Caring for your heal ...