课程目录：
├──Unit1
| ├──Unit1SectionA1a-2d
| | ├──U1A1b.mp3 806.89kb
| | ├──U1A2a.mp3 821.97kb
| | ├──U1A2d.mp3 758.73kb
| | └──Unit1SectionA1a-2d.ppt 6.23M
| ├──Unit1SectionA3a-3b
| | ├──U1A3a.mp3 1.33M
| | └──Unit1SectionA3a-3b.ppt 8.97M
| ├──Unit1SectionAGrammarFocus-4c
| | └──Unit1SectionAGrammarFocus-4c.ppt 4.28M
| ├──Unit1SectionB1a-1e
| | ├──U1B1c.mp3 1.28M
| | └──Unit1SectionB1a-1e.ppt 3.46M
| ├──Unit1SectionB2a-2e
| | ├──U1B2b.mp3 2.51M
| | └──Unit1SectionB2a-2e.ppt 3.67M
| └──Unit1SectionB3a-SelfCheck
| | └──Unit1SectionB3a-SelfCheck.ppt 3.96M
├──Unit2
| ├──Unit2SectionA1a-2d
| | ├──U2A1b.mp3 775.46kb
| | ├──U2A2a.mp3 1013.83kb
| | ├──U2A2d.mp3 657.91kb
| | └──Unit2SectionA1a-2d.ppt 5.33M
| ├──Unit2SectionA3a-3c
| | ├──U2A3a.mp3 1.67M
| | └──Unit2SectionA3a-3c.ppt 5.24M
| ├──Unit2SectionAGrammarFocus-4c
| | └──Unit2SectionAGrammarFocus-4c.ppt 3.48M
| ├──Unit2SectionB1a-1d
| | ├──U2B1b.mp3 1.08M
| | └──Unit2SectionB1a-1d.ppt 5.35M
| ├──Unit2SectionB2a-2e
| | ├──U2B2b.mp3 2.46M
| | └──Unit2SectionB2a-2e.ppt 5.81M
| └──Unit2SectionB3a-SelfCheck
| | └──Unit2SectionB3a-SelfCheck.pptx 6.07M
├──Unit3
| ├──Unit3SectionA1a-2d
| | ├──U3A1b.mp3 938.70kb
| | ├──U3A2a.mp3 686.46kb
| | ├──U3A2d.mp3 882.78kb
| | └──Unit3SectionA1a-2d.ppt 7.63M
| ├──Unit3SectionA3a-3b
| | ├──U3A3a.mp3 1.63M
| | └──Unit3SectionA3a-3b.ppt 4.22M
| ├──Unit3SectionAGrammarFocus-4c
| | └──Unit3SectionAGrammarFocus-4c.ppt 3.02M
| ├──Unit3SectionB1a-1e
| | ├──U3B1c.mp3 1.73M
| | └──Unit3SectionB1a-1e.ppt 4.80M
| ├──Unit3SectionB2a-2d
| | ├──U3B2b.mp3 2.18M
| | └──Unit3SectionB2a-2d.ppt 4.15M
| └──Unit3SectionB3a-SelfCheck
| | └──Unit3SectionB3a-SelfCheck.ppt 3.06M
├──Unit4
| ├──Unit4SectionA1a-2d
| | ├──U4A1b.mp3 1.17M
| | ├──U4A2a.mp3 933.42kb
| | ├──U4A2d.mp3 698.29kb
| | └──Unit4SectionA1a-2d.ppt 6.65M
| ├──Unit4SectionA3a-3c
| | ├──SectionA3a.wav 20.19M
| | └──Unit4SectionA3a-3c.pptx 2.59M
| ├──Unit4SectionAGrammarFocus-4c
| | └──Unit4SectionAGrammarFocus-4c.ppt 2.87M
| ├──Unit4SectionB1a-1e
| | ├──U4B1c.mp3 948.11kb
| | └──Unit4SectionB1a-1e.ppt 3.60M
| ├──Unit4SectionB2a-2f
| | ├──U4B2b.mp3 2.39M
| | └──Unit4SectionB2a-2f.ppt 7.13M
| └──Unit4SectionB3a-SelfCheck
| | └──Unit4SectionB3a-SelfCheck.ppt 2.12M
├──Unit5
| ├──Unit5SectionA1a-2d
| | ├──U5A1b.mp3 883.21kb
| | ├──U5A2a.mp3 845.64kb
| | ├──U5A2d.mp3 726.07kb
| | └──Unit5SectionA1a-2d.ppt 5.64M
| ├──Unit5SectionA3a-3c
| | ├──U5A3a.mp3 1.81M
| | └──Unit5SectionA3a-3c.ppt 4.20M
| ├──Unit5SectionAGrammarFocus-4c
| | └──Unit5SectionAGrammarFocus-4c.ppt 2.87M
| ├──Unit5SectionB1a-1e
| | ├──U5B1b.mp3 895.46kb
| | └──Unit5SectionB1a-1e.ppt 5.55M
| ├──Unit5SectionB2a-2e
| | ├──U5B2b.mp3 2.29M
| | └──Unit5SectionB2a-2e.ppt 5.35M
| └──Unit5SectionB3a-SelfCheck
| | └──Unit5SectionB3a-SelfCheck.ppt 3.59M
├──Unit6
| ├──Unit6SectionA1a-2d
| | ├──U6A1b.mp3 951.35kb
| | ├──U6A2a.mp3 923.19kb
| | ├──U6A2d.mp3 928.50kb
| | └──Unit6SectionA1a-2d.ppt 6.40M
| ├──Unit6SectionA3a-3c
| | ├──U63a.mp3 2.84M
| | ├──u63apara1.mp3 862.21kb
| | ├──U63apara2.mp3 389.56kb
| | ├──U63apara3.mp3 859.35kb
| | ├──Unit6SectionA3a-3c.ppt 3.87M
| | ├──茶的起源.mp4 43.57M
| | └──茶文化介绍.mp4 6.46M
| ├──Unit6SectionAGrammarFocus-4c
| | └──Unit6SectionAGrammarFocus-4c.ppt 3.24M
| ├──Unit6SectionB1a-1e
| | ├──U6B1c.mp3 995.05kb
| | └──Unit6SectionB1a-1e.ppt 4.41M
| ├──Unit6SectionB2a-2e
| | ├──U6SectionB2b.mp3 5.75M
| | ├──U6SectionB2bpara1.mp3 659.35kb
| | ├──U6SectionB2bpara2.mp3 749.56kb
| | ├──U6SectionB2bpara3.mp3 1.11M
| | └──Unit6SectionB2a-2e.ppt 4.51M
| └──Unit6SectionB3a-SelfCheck
| | └──Unit6SectionB3a-SelfCheck.ppt 2.69M
├──Unit7
| ├──Unit7SectionA1a-2d
| | ├──U7A1b.mp3 859.95kb
| | ├──U7A2a.mp3 1.09M
| | ├──U7A2d.mp3 602.81kb
| | └──Unit7SectionA1a-2d.pptx 7.11M
| ├──Unit7SectionA3a-3c
| | ├──U7A3a.mp3 1.80M
| | └──Unit7SectionA3a-3c.pptx 5.54M
| ├──Unit7SectionAGrammarFocus-4c
| | └──Unit7SectionAGrammarFocus-4c.ppt 2.40M
| ├──Unit7SectionB1a-1e
| | ├──U7B1c.mp3 764.85kb
| | └──Unit7SectionB1a-1e.pptx 5.95M
| ├──Unit7SectionB2a-2e
| | ├──U7B2b.mp3 2.38M
| | └──Unit7SectionB2a-2e.pptx 4.35M
| └──Unit7SectionB3a-SelfCheck
| | └──Unit7SectionB3a-SelfCheck.ppt 2.87M
└──Unit8
| ├──Unit8SectionA1a-2d
| | ├──U8A1b.mp3 573.83kb
| | ├──U8A2a.mp3 698.73kb
| | ├──U8A2d.mp3 741.17kb
| | └──Unit8SectionA1a-2d.pptx 3.17M
| ├──Unit8SectionA3a-3c
| | ├──U8A3a.mp3 1.52M
| | └──Unit8SectionA3a-3c.ppt 2.81M
| ├──Unit8SectionAGrammarFocus-4c
| | └──Unit8SectionAGrammarFocus-4c.ppt 2.96M
| ├──Unit8SectionB1a-1d
| | ├──U8B1b.mp3 1.15M
| | └──Unit8SectionB1a-1d.pptx 4.09M
| ├──Unit8SectionB2a-2e
| | ├──U8B2b.mp3 2.46M
| | └──Unit8SectionB2a-2e.pptx 2.65M
| └──Unit8SectionB3a-SelfCheck
| | └──Unit8SectionB3a-SelfCheck.pptx 2.62M
