新概念英语第四册第21课:William S.Hart and the early 'Western' film
Lesson 21 William S. Hart and the early Western film威廉.S. 哈特和早期限的‘西部’影片First listen and then answer
新概念英语第四册第19课:The stuff of dreams
Lesson 19 The stuff of dreams话说梦的本质First listen and then answer the following question.听录音，然后回答以下问题。What is goi
新概念英语第四册第20课:Snake poison
Lesson 20 Snake poison蛇毒First listen and then answer the following question.听录音，然后回答以下问题。What are the two different way
新概念英语第四册第16课:The modern city
Lesson 16 The modern city现代城市First listen and then answer the following question.听录音，然后回答以下问题。What is the authors m
新概念英语第四册第17课:A man-made disease
Lesson 17 A man-made disease人为的疾病First listen and then answer the following question.听录音，然后回答以下问题。What factor hel
新概念英语第四册第18课:Porpoises
Lesson 18 Porpoises海豚First listen and then answer the following question.听录音，然后回答以下问题。What would you say is the main ch
新概念英语第四册第14课:The Butterfly Effect
Lesson 14 The Butterfly Effect蝴蝶效应First listen and then answer the following question.听录音，然后回答以下问题。Why do small err
新概念英语第四册第13课:The search for oil
Lesson 13 The search for oil探寻石油First listen and then answer the following question.听录音，然后回答以下问题。What do oilmen wan
新概念英语第四册第15课:Secrecy in industry
Lesson 15Secrecy in industry工业中的秘密First listen and then answer the following question.听录音，然后回答以下问题。Why is secre
新概念英语第四册第11课:How to grow old
Lesson 11 How to grow old如何安度晚年First listen and then answer the following question.听录音，然后回答以下问题。What, according