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
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1课:Finding Fossil man
Lesson 1 Finding fossil man发现化石人First listen and then answer the following question.听录音，然后回答以下问题。Why are legends
新概念英语第四册第2课:Spare that spider
Lesson 2 Spare that spider不要伤害蜘蛛First listen and then answer the following question.听录音，然后回答以下问题。How much of ea
新概念英语第四册第3课:Matterhorn man
Lesson 3 Matterhorn man马特霍恩山区人First listen and then answer the following question.听录音，然后回答以下问题。What was the m
新概念英语第三册第53课:In the public interest
Lesson 53 In the public interest为了公众的利益Listen to the tape then answer the question below.听录音，然后回答以下问题。What co