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
新概念英语第四册第9课:Royal espionage
Lesson 9 Royal espionage王室谍报活动First listen and then answer the following question.听录音，然后回答以下问题。What important t
新概念英语第四册第12课:Banks and their customers
Lesson 12 Banks and their customers银行和顾客First listen and then answer the following question.听录音，然后回答以下问题。Why is t
新概念英语第四册第10课:Silicon valley
Lesson 10 Silicon valley硅谷First listen and then answer the following question.听录音，然后回答以下问题。What does the computer indus