Lesson 1 Finding fossil manLesson 2 Spare that spiderLesson 3 Matterhorn manLesson 4 Seeing handsLesson 5 YouthLesson 6 The sporting spiritLesson 7 BatsLesson 8 Trading standardsLesson 9 Royal espionageLesson 10 Silicon valleyLesson 11 How to grow old?Lesson 12 Banks and their customersLesson 13 The search for oilLesson 14 The Butterfly EffectLesson 15 Secrecy in industryLesson 16 The modern cityLesson 17 A man-made diseaseLesson 18 PorpoisesLesson 19 The stuff of dreamsLesson 20 Snake poisonLesson 21 Williams S. Hart and the early "Western" film.Lesson 22 Knowledge and progressLesson 23 Bird flightLesson 24 BeautyLesson 25 Non-auditory effects of noiseLesson 26 The past life of the earthLesson 27 The"Vasa"Lesson 28 Patients and doctorsLesson 29 The hovercraftLesson 30 Exploring the sea-floorLesson 31 The sculptor speaksLesson 32 Galileo rebornLesson 33 EducationLesson 34 AdolescenceLesson 35 Space odysseyLesson 36 The cost of governmentLesson 37 The process of ageingLesson 38 Water and the travellerLesson 39 What every writer wantsLesson 40 WavesLesson 41 Training elephantsLesson 42 Recording an earthquakeLesson 43 Are there strangers in space？Lesson 44 Patterns of cultureLesson 45 Of men and galaxiesLesson 46 HobbiesLesson 47 The great escapeLesson 48 Planning a share portfolio《新概念英语》(第四册)课后习题答案