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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5课:Youth
Lesson 5 Youth青年First listen and then answer the following question:听录音，然后回答以下问题。How does the writer like to treat youn
新概念英语第四册第36课:The cost of government
Lesson 36 The cost of government政府的开支First listen and then answer the following question.听录音，然后回答以下问题。What is the most
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 helped to
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 main
新概念英语第四册第34课:Adolescence
Lesson 34 Adolescence青春期First listen and then answer the following question.听录音，然后回答以下问题。What do adolescents respect in
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 secrecy parti
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
