1．A Hawk

2．Air

3．Algae

4．An Ape

5．Animals and Aestivation

6．Animals and Men

7．Animals and Their Languages

8．Animals and Their Partners

9．Animals Can Be Made to Work for Men

10．Antarctica（Ⅰ）

11．Antarctica（Ⅱ）

12．Amoebas

13．Appearance of EL Ni？o

14．Apple Trees

15．A Tornado

16．A Trained Dog

17．A Tree Frog

18．Bamboo（Ⅰ）

19．Bamboo（Ⅱ）

20．Bats

21．Beavers（Ⅰ）

22．Beavers（Ⅱ）

23．Beavers（Ⅲ）

24．Birds that"See"with Their Ears

25．Butterflies

26．Can Animals Tell Colours?

27．Can Frogs Breathe under Water?

28．Can Trees Talk?

29．Cats（Ⅰ）

30．Cats（Ⅱ）

31．Clouds and Fogs

32．Cobra

33．Coconuts

34．Crocodiles

35．Deserts（Ⅰ）

36．Deserts（Ⅱ）

37．Dogs and Colours

38．Dolphins

39．Double Sun

40．Do You Talk to Plants?

41．Earthquakes

42．Earthworms

43．Elephants（Ⅰ）

44．Elephants（Ⅱ）

45．Elephants（Ⅲ）

46．Every Animal Is a Living Radiator

47．Fish Can Hear Sounds

48．Fish from the Deep

49．Fleas

50．Folk Weather Sayings

51．Foxes

52．Gorillas

53．Growing Plants Know Directions

54．How Do Animals Act towards Men?

55．How Do Bats Find Their Way in the Dark?

56．How Long Do Fishes Live?

57．How to Plant a Garden

58．How to Protect Animals

59．How to Transplant a Tree

60．Hurricanes

61．Icebergs

62．Jumping Mice

63．Koalas

64．Lightning

65．Man and the Sea

66．Men and Rats

67．Monkeys（Ⅰ）

68．Monkeys（Ⅱ）

69．Monkeys（Ⅲ）

70．Mosquitoes

71．Musical Sands

72．Orangutans

73．Owls

74．Pigeons

75．Rainfall（Ⅰ）

76．Rainfall（Ⅱ）

77．Sea Otters

78．Sea Worms

79．Shaking Fruit Trees Can Be a Real Art

80．Sharks

81．Snakes

82．Spiders

83．St. Bernard Dogs

84．The Age of a Tree

85．The Animal and Its Speed

86．The Ant Lion

87．The Ants

88．The Baboon

89．The Baobab Tree

90．The Basenji

91．The Bee

92．The Blue Tits

93．The Brown Bear

94．The Cactus

95．The Camel

96．The Chimpanzee

97．The Colours of the Ocean

98．The Dodo

99．The Eskimo Sled Dog

100．The Fiddler Crab

101．The Flying Fox（Ⅰ）

102．The Flying Fox（Ⅱ）

103．The Garter Snake

104．The Green Turtles

105．The Ideal City Tree

106．The Important Service of Trees to Man

107．The Interesting Giraffe

108．The Jackdaw

109．The Jaguar

110．The Leopard

111．The Lion

112．The Ocean and the Atmosphere

113．The Opossum

114．The Ostrich

115．The Panda

116．The Peppered Moth

117．The Pintail Ducks

118．The Piranha

119．The Praying Mantis

120．The Racoon

121．The Rattlesnake

122．The Sea

123．The Sea Horse

124．The Useful Mice

125．The Water-breathing Rats

126．The White-headed Leaf Monkey

127．Thunderstorms

128．Tigers

129．Travelling Rats

130．Tree Rings and Rainfall

131．Turtles

132．Two Existing Species of Bison

133．Volcanoes

134．Water（Ⅰ）

135．Water（Ⅱ）

136．Weasels

137．Whales（Ⅰ）

138．Whales（Ⅱ）

139．Whales（Ⅲ）

140．What Do We Do with the Fish?

141．Why Don't Birds Get Lost on Long Flights?

Key to the Tests

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