- Lesson 01 Finding fossil man
- 09:06 免费Lesson 01 Finding fossil man（ ...
- 31:08 免费Lesson 01 Finding fossil man（ ...
- 08:41
免费Lesson 01 Finding fossil man（ ... - Lesson 02 Spare that spider
- 06:08 试看Lesson 02 Spare that spider（单 ...
- 29:03 试看Lesson 02 Spare that spider（课 ...
- 03:02 试看Lesson 02 Spare that spider（知 ...
- Lesson 03 Matterhorn man
- 10:08 试看Lesson 03 Matterhorn man（单词 ...
- 30:52 试看Lesson 03 Matterhorn man（课文 ...
- 10:48 试看Lesson 03 Matterhorn man（知识 ...
- Lesson 04 Seeing hands
- 02:52 试看Lesson 04 Seeing hands（单词讲 ...
- 27:49 试看Lesson 04 Seeing hands（课文讲 ...
- 04:34 试看Lesson 04 Seeing hands（知识拓 ...
- Lesson 05 Youth
- 05:16 试看Lesson 05 Youth（单词讲解） ...
- 25:03 试看Lesson 05 Youth（课文讲解） ...
- 11:48 试看Lesson 05 Youth（知识拓展）【成 ...
- Lesson 06 The sporting spirit
- 07:47 试看Lesson 06 The sporting spirit（ ...
- 34:56 试看Lesson 06 The sporting spirit（ ...
- 05:43 试看Lesson 06 The sporting spirit（ ...
- Lesson 07 Bats
- 05:19 试看Lesson 07 Bats（单词讲解） ...
- 22:09 试看Lesson 07 Bats（课文讲解） ...
- 07:48 试看Lesson 07 Bats（知识拓展）【成 ...
- Lesson 08 Trading standards
- 08:01 试看Lesson 08 Trading standards（单 ...
- 20:38 试看Lesson 08 Trading standards（课 ...
- 04:26 试看Lesson 08 Trading standards（知 ...
- Lesson 09 Royal espionage
- 02:56 试看Lesson 09 Royal espionage（单词 ...
- 14:37 试看Lesson 09 Royal espionage（课文 ...
- 07:52 试看Lesson 09 Royal espionage（知识 ...
- Lesson 10 Silicon valley
- 37:53 试看Lesson 10 Silicon valley（课文 ...
- 08:39 试看Lesson 10 Silicon valley（单词 ...
- 03:36 试看Lesson 10 Silicon valley（知识 ...
- Lesson 11 How to grow old
- 07:25 试看Lesson 11 How to grow old（单词 ...
- 30:02 试看Lesson 11 How to grow old（课文 ...
- 05:26 试看Lesson 11 How to grow old（知识 ...
- Lesson 12 Banks and their customers
- 05:55 试看Lesson 12 Banks and their custo ...
- 22:43 试看Lesson 12 Banks and their custo ...
- 04:06 试看Lesson 12 Banks and their custo ...
- Lesson 13 The search for oil
- 01:36 试看Lesson 13 The search for oil（ ...
- 17:40 试看Lesson 13 The search for oil（ ...
- 04:59 试看Lesson 13 The search for oil（ ...
- Lesson 14 The Butterfly Effect
- 12:06 试看Lesson 14 The Butterfly Effect ...
- 38:23 试看Lesson 14 The Butterfly Effect ...
- 03:36 试看Lesson 14 The Butterfly Effect ...
- Lesson 15 Secrecy in industry
- 04:10 试看Lesson 15 Secrecy in industry（ ...
- 18:21 试看Lesson 15 Secrecy in industry（ ...
- 04:41 试看Lesson 15 Secrecy in industry（ ...
- Lesson 16 The modern city
- 10:17 试看Lesson 16 The modern city（单词 ...
- 21:00 试看Lesson 16 The modern city（课文 ...
- 04:03 试看Lesson 16 The modern city（知识 ...
- Lesson 17 A man-made disease
- 07:38 试看Lesson 17 A man-made disease（ ...
- 18:22 试看Lesson 17 A man-made disease（ ...
- 06:34 试看Lesson 17 A man-made disease（ ...
- Lesson 18 Porpoises
- 14:02 试看Lesson 18 Porpoises（单词讲解） ...
- 32:51 试看Lesson 18 Porpoises（课文讲解） ...
- 03:32 试看Lesson 18 Porpoises（知识拓展） ...
- Lesson 19 The stuff of dreams
- 08:00 试看Lesson 19 The stuff of dreams（ ...
- 33:10 试看Lesson 19 The stuff of dreams（ ...
- 09:08 试看Lesson 19 The stuff of dreams（ ...
- Lesson 20 Snake poison
- 09:29 试看Lesson 20 Snake poison（单词讲 ...
- 35:37 试看Lesson 20 Snake poison（课文讲 ...
- 02:50 试看Lesson 20 Snake poison（知识拓 ...
- Lesson 21 William S.Hart and the early‘Western’film
- 08:08 试看Lesson 21 William S.Hart and th ...
- 43:38 试看Lesson 21 William S.Hart and th ...
- 06:25 试看Lesson 21 William S.Hart and th ...
- Lesson 22 Knowledge and progress
- 09:58 试看Lesson 22 Knowledge and progres ...
- 26:05 试看Lesson 22 Knowledge and progres ...
- 05:04 试看Lesson 22 Knowledge and progres ...
- Lesson 23 Bird flight
- 04:41 试看Lesson 23 Bird flight（单词讲解 ...
- 26:54 试看Lesson 23 Bird flight（课文讲解 ...
- 08:07 试看Lesson 23 Bird flight（知识拓展 ...
- Lesson 24 Beauty
- 09:28 试看Lesson 24 Beauty（单词讲解） ...
- 33:01 试看Lesson 24 Beauty（课文讲解） ...
- 02:36 试看Lesson 24 Beauty（知识拓展）【 ...
- Lesson 25 Non-auditory effects of noise
- 04:55 试看Lesson 25 Non-auditory effects ...
- 29:11 试看Lesson 25 Non-auditory effects ...
- 07:34 试看Lesson 25 Non-auditory effects ...
- Lesson 26 The past life of the earth
- 04:52 试看Lesson 26 The past life of the ...
- 30:29 试看Lesson 26 The past life of the ...
- 02:51 试看Lesson 26 The past life of the ...
- Lesson 27 The ‘Vasa’
- 34:54 试看Lesson 27 The ‘Vasa’（课文讲 ...
- 07:15 试看Lesson 27 The ‘Vasa’（单词讲 ...
- 08:29 试看Lesson 27 The ‘Vasa’（知识拓 ...
- Lesson 28 Patients and doctors
- 08:54 试看Lesson 28 Patients and doctors ...
- 50:19 试看Lesson 28 Patients and doctors ...
- 04:10 试看Lesson 28 Patients and doctors ...
- Lesson 29 The hovercraft
- 01:23 试看Lesson 29 The hovercraft（单词 ...
- 18:03 试看Lesson 29 The hovercraft（课文 ...
- 05:10 试看Lesson 29 The hovercraft（知识 ...
- Lesson 30 Exploring the sea-floor
- 04:49 试看Lesson 30 Exploring the sea-flo ...
- 30:36 试看Lesson 30 Exploring the sea-flo ...
- 04:33 试看Lesson 30 Exploring the sea-flo ...
- Lesson 31 The sculptor speaks
- 03:58 试看Lesson 31 The sculptor speaks（ ...
- 33:58 试看Lesson 31 The sculptor speaks（ ...
- 08:39 试看Lesson 31 The sculptor speaks（ ...
- Lesson 32 Galileo reborn
- 07:48 试看Lesson 32 Galileo reborn（单词 ...
- 50:42 试看Lesson 32 Galileo reborn（课文 ...
- 02:42 试看Lesson 32 Galileo reborn（知识 ...
- Lesson 33 Education
- 07:16 试看Lesson 33 Education（单词讲解） ...
- 52:02 试看Lesson 33 Education（课文讲解） ...
- 08:49 试看Lesson 33 Education（知识拓展） ...
- Lesson 34 Adolescence
- 04:01 试看Lesson 34 Adolescence（单词讲解 ...
- 38:00 试看Lesson 34 Adolescence（课文讲解 ...
- 02:21 试看Lesson 34 Adolescence（知识拓展 ...
- Lesson 35 Space odyssey
- 02:59 试看Lesson 35 Space odyssey（单词讲 ...
- 21:21 试看Lesson 35 Space odyssey（课文讲 ...
- 09:07 试看Lesson 35 Space odyssey（知识拓 ...
- Lesson 36 The cost of government
- 03:16 试看Lesson 36 The cost of governmen ...
- 25:18 试看Lesson 36 The cost of governmen ...
- 02:00 试看Lesson 36 The cost of governmen ...
- Lesson 37 The process of ageing
- 05:46 试看Lesson 37 The process of ageing ...
- 46:12 试看Lesson 37 The process of ageing ...
- 10:04 试看Lesson 37 The process of ageing ...
- Lesson 38 Water and the traveller
- 07:04 试看Lesson 38 Water and the travell ...
- 38:37 试看Lesson 38 Water and the travell ...
- 02:53 试看Lesson 38 Water and the travell ...
- Lesson 39 What every writer wants
- 04:38 试看Lesson 39 What every writer wan ...
- 38:59 试看Lesson 39 What every writer wan ...
- 08:23 试看Lesson 39 What every writer wan ...
- Lesson 40 Waves
- 04:31 试看Lesson 40 Waves（单词讲解） ...
- 37:21 试看Lesson 40 Waves（课文讲解） ...
- 06:11 试看Lesson 40 Waves（知识拓展）【成 ...
- Lesson 41 Training elephants
- 04:23 试看Lesson 41 Training elephants（ ...
- 28:09 试看Lesson 41 Training elephants（ ...
- 12:49 试看Lesson 41 Training elephants（ ...
- Lesson 42 Recording an earthquake
- 02:44 试看Lesson 42 Recording an earthqua ...
- 35:04 试看Lesson 42 Recording an earthqua ...
- 04:11 试看Lesson 42 Recording an earthqua ...
- Lesson 43 Are there strangers in space
- 03:02 试看Lesson 43 Are there strangers i ...
- 46:27 试看Lesson 43 Are there strangers i ...
- 11:35 试看Lesson 43 Are there strangers i ...
- Lesson 44 Patterns of culture
- 12:21 试看Lesson 44 Patterns of culture（ ...
- 51:37 试看Lesson 44 Patterns of culture（ ...
- 03:33 试看Lesson 44 Patterns of culture（ ...
- Lesson 45 Of men and galaxies
- 03:57 试看Lesson 45 Of men and galaxies（ ...
- 46:15 试看Lesson 45 Of men and galaxies（ ...
- 10:49 试看Lesson 45 Of men and galaxies（ ...
- Lesson 46 Hobbies
- 09:21 试看Lesson 46 Hobbies（单词讲解） ...
- 1:00:36 试看Lesson 46 Hobbies（课文讲解） ...
- 02:47 试看Lesson 46 Hobbies（知识拓展）【 ...
- Lesson 47 The great escape
- 08:19 试看Lesson 47 The great escape（单 ...
- 1:05:21 试看Lesson 47 The great escape（课 ...
- 12:27 试看Lesson 47 The great escape（知 ...
- Lesson 48 Planning a share portfolio
- 07:22 试看Lesson 48 Planning a share port ...
- 25:14 试看Lesson 48 Planning a share port ...
- 02:27 试看Lesson 48 Planning a share port ...