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
新概念英语第四册第6课:The sporting spirit
Lesson 6 The sporting spirit体育的精神First listen and then answer the following question.听录音，然后回答以下问题.How does the writ
新概念英语第四册第7课:Bats
Lesson 7 Bats蝙蝠First listen and then answer the following question.听录音，然后回答以下问题。In what way does echo-location in bats
新概念英语第四册第4课:Seeing hands
Lesson 4 Seeing hands能看见东西的手First listen and answer the following question.听录音，然后回答以下问题。How did Vera discover
新概念英语第四册第8课:Trading standards
Lesson 8 Trading standards贸易标准First listen and then answer the following question.听录音，然后回答以下问题。What makes trading be