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Unit Three 1

47．The American Scene 1

48．The Voices of Time 10

49．A World Without Oil 17

50．The Tornado 22

51．Venus—the Burning Question 30

52．My Uncle 35

53．Running for Governor 41

54．Factory Life—a Student's Experience 46

55．The Open Boat 52

56．Electric Fish 60

57．The Vanishing Lady 65

58．The Cable That Crossed the Atlantic 76

59．The Mistake 84

60．Dr.Einstein's Marvelous Flying Machine 90

Unit Four 96

61．Shipwreck 96

62．Black Holes 113

63．Time Zones and the Date Line 119

64．A New Kind of Whale 124

65．School and Life 140

66．A Warmer or a Colder Earth? 145

67．Smoking and Cancer 150

68．A Robot About the House 155

69．The Olympic Games 163

70．Plague and Fire 168

71．Symptoms 177

72．After Twenty Years 184

Key to Exercises 192