Lesson 15 Secrecy in industry 工业中的秘密 First listen and then answer the following question. 听 ...

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Unit 2 Lesson 10 Silicon valley 硅谷 First listen and then answer the following question. 听录音， ...

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Unit 2 Lesson 12 Banks and their customers 银行和顾客 First listen and then answer the following qu ...

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Lesson 11 How to grow old 如何安度晚年 First listen and then answer the following question. 听录音 ...

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Lesson 13 The search for oil 探寻石油 First listen and then answer the following question. 听录音， ...

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Lesson 14 The Butterfly Effect 蝴蝶效应 First listen and then answer the following question. 听录音 ...

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Lesson 17 A man-made disease 人为的疾病 First listen and then answer the following question. 听录音 ...

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Lesson 48 Planning a share portfolio 规划股份投资 First listen and then answer the following questi ...

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Lesson 18 Porpoises 海豚 First listen and then answer the following question. 听录音，然后回答以下 ...

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Lesson 47 The great escape 大逃亡 First listen and then answer the following quesion. 听录音，然后 ...

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Lesson 41 Training elephants 训练大象 First listen and then answer the following question. 听录音， ...

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Lesson 19 The stuff of dreams 话说梦的本质 First listen and then answer the following question. 听 ...

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Lesson 45 Of men and galaxies 人和星系 First listen and then answer the following question. 听录音 ...

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Lesson 42 Recording an earthquake 记录地震 First listen and then answer the following question. 听 ...

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Lesson 20 Snake poison 蛇毒 First listen and then answer the following question. 听录音，然后回答以 ...

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Lesson 43 Are there strangers in space? 宇宙中有外星人吗？ First listen and then answer the followi ...

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Lesson 46 Hobbies 业余爱好 First listen and then answer the following question. 听录音，然后回答以 ...

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Lesson 38 The first calender 最早的日历 Listen to the tape then answer the question below. 听录音， ...

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Lesson 59 Collecting 收藏 Listen to the tape then answer the question below. 听录音，然后回答以下问 ...

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Lesson 49 The ideal servant 理想的仆人 Listen to the tape then answer the question below. 听录音， ...

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