《知道吗?》

1．Mr．，Mrs．，Miss and Ms．1

2．The First Stamps2

3．How Did April Fool's Day Begin？5

4．Why Do Barber Shops Have Red and White Poles？7

5．Why Do Men Have Buttons on Their Jacket Sleeves？9

6．What Is the Riddle of the Sphinx？11

7．What Causes Waves？12

8．The Birth of an Island15

9．How Civilization Can Die？17

10．Some Things Do Not Change19

11．The Longest River21

12．The Longest Fence in the World24

13．Antonio Gaudi and His Church26

14．The Tragedy of Saint-Pierre28

15．Animals Which Live a Long Time30

16．Snakes32

17．An Insect That Opens Doors35

18．The Fastest Tongue on Earth38

19．Pigeon Talk41

20．Monkey Intelligence43

21．A Shooting Animal45

22．Quiet！Worms at Work49

23．Good Parents in Antarctica50

24．Our Most Dangerous Enemy—the Rat52

25．Tiny but Beautiful54

26．The Tree of Life57

27．Eating the Sun59

28．The Children of the Sun60

29．Life and Death of a Sun62

30．The Baby in the Silver Suit64

31．What Does Man Do with His Big Brain？67

32．Blood to Save Lives68

33．Roman Physicians70

34．How the Olympic Games Started72

35．Women in the Olympics74

36．The Closing of the Games76

37．Basketball78

38．The Origin of words80

39．World of Words83

40．Slang84

41．Two Languages or One？86

42．Colourful Language87

43．The English Language89

44．Where Did Americans Come from？92

45．American Indians93

46．Which States in the U．S．Have the Most People？95

47．How Did the States in the U．S．Get Their Names？96

48．The Congress of the United States98

49．The Climate of the United Statcs101

50．New York Is More102

51．Which Washington？104

52．Schools in the U．S．A．108

53．Mail Service in the U．S．A．109

54．The Throwaway Society110

55．Town and Country112

56．Living under Cover115

57．An Indoor Town117

58．A City at Sea119

59．Food122

60．Jam and Pickle124

61．Drying and Smoking125

62．Food Decay127

63．Bottles and Cans128

64．Refrigeration130

65．Salt（Ⅰ）132

66．Salt（Ⅱ）135

67．Clothmaking137

68．Wool，Cotton，or Nylon？139

69．Plastics140

70．Fly with Wings Made from Chicken Feathers142

71．A Strange Thing from the Sky144

72．Early Passenger Service146

73．Have You Anything to Declare？148

74．A New Way to Fly150

75．Steam Cars152

76．Cars for Tomorrow155

77．Hovercraft157

78．Hovertrains160

79．A New Lifeboat163

80．What Is a Camera？165

81．Seeing Aid167

82．Adjustable-focus Glasses168

83．Manual Marvel170

84．I Saw Him on the Phone Today172

85．Across the Atlantic by Computer174

86．The Computer and the Motor-car177

87．Computer Helps Fire Fighters179

88．Zero Hour181

89．Satellites in the Solar System183

90．Space Research185

APPENDIX1 KEY TO EXERCISES188

APPENDIX2 VOCABULARY194