Our knowledge of the oceans a hundred years ago was confined to the two-dimensional shape of the sea-surface and the hazards of navigation presented by the irregularities in depth of the shallow water close to the land. The open sea was deep and mys...
Lesson 29 The hovercraft 气垫船 First listen and then answer the following question. 听录音，然后回答以下问题。 What is a hovercraft riding on when it is in motion? Many strange new means of transport have been developed in our century...
Lesson 28 Patients and doctors 病人与医生 First listen and then answer the following question. 听录音，然后回答以下问题。 What are patients looking for when they visit the doctor? This is a sceptical age, but although our faith in ma...
Lesson 27 The 'Vasa' 瓦萨号 First listen and then answer the following question. 听录音，然后回答以下问题。 What happened to the 'Vasa' almost immediately after she was launched? From the seventeenth-century empire of Sweden, the story...
Lesson 26 The past life of the earth 地球上的昔日生命 First listen and then answer the following question. 听录音，然后回答以下问题。 What is the main condition for the preservation of the remains of any living creature? It is ani...
Lesson 25 Non-auditory effects of noise 噪音的非听觉效应 First listen and then answer the following question. 听录音，然后回答以下问题。 What conclusion does the author draw about noise and health in this piece? May people in indu...
Lesson 24 Beatuy 美 First listen and then answer the following question. 听录音，然后回答以下问题。 What do glimpses of beauty, either in nature or art, often suggest to the human mind? A young man sees a sunset and, unable to understand...
Lesson 23 Bird flight 鸟的飞行方法 First listen and then answer the following question. 听录音，然后回答以下问题。 What are the two main types of bird flight described by the author? No two sorts of birds practise quite the same sor...
Lesson 22 Knowledge and progress 知识和进步 First listen and then answer the following question. 听录音，然后回答以下问题。 In what two areas have people made no 'progress' at all? Why does the idea of progress loom so large in the m...
Lesson 21 William S. Hart and the early 'Western' film 威廉.S. 哈特和早期限的西部影片 First listen and then answer the following question. 听录音，然后回答以下问题。 How did William Hart's childhood prepare him for his acting...
