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Passage 3 How Clothes Are Made42

Unit Thirty-five The Man's Invention45

Passage 1 The Invention of Wheels45

Passage 2 Making of Paper and Pencil47

Passage 3 The Invention of Bicycles49

Passage 4 How Did Stamps Come into Use51

Unit Thirty-six The Animal World（Ⅰ）53

Passage 1 Animal Mimics53

Passage 2 The Frog That Changes Colour56

Passage 3 Different Groups of Animals58

Passage 4 The Animal Without a Head60

Unit Thirty-seven The Animal world（Ⅱ）62

Passage 1 Insects62

Passage 2 Ants65

Passage 3 Fishes67

Passage 4 Reptiles69

Unit Thirty-eight The Animal World（Ⅲ）71

Passage 1 Birds71

Passage 2 Mammals74

Passage 3 The Biggest and the Gentlest76

Passage 4 The World of Microbes79

Unit Thirty-nine The Balance of Nature82

Passage 1 The Balance of Nature82

Passage 2 The Squirrel and The Acorn85

Passage 3 The Food Chain87

Passage 4 Our Best Friends-Trees90

Unit Forty Plants（Ⅰ）92

Passage 1 Plants92

Passage 2 Different Types of Leaves94

Passage 3 Different Types of Stems96

Unit Forty-one Stories of Nature98

Passage 1 The Story of Raindrop98

Passage 2 Water,Steam and Ice100

Passage 3 The Birth of a Volcano102

Passage 4 Terrible Earthquakes105

Unit Forty-two Light108

Passage 1 Light108

Passage 2 How Light Travels111

Passage 3 Reflection of Light113

Passage 4 Shadows115

Unit Forty-three Heat118

Passage 1 What Gives Heat?118

Passage 2 Heat Travels by Conduction121

Passage 3 Heat Travels by Convection123

Passage 4 Shadows125

Unit Forty-four Sounds128

Passage 1 Are Sounds Useful or Harmful128

Passage 2 How Do We Make Sounds?131

Passage 3 How Does Sound Travel?133

Passage 4 Sound Has Speed135

Unit Forty-five Atoms and Molecules138

Passage 1 Leaning about Molecules138

Passage 2 Molecules Pull140

Passage 3 Structure of the Atom142

Passage 4 Nuclear Energy145

Unit Forty-six Exploring the Space147

Passage 1 The Sun and the Stars147

Passage 2 Air and the Space149

Passage 3 The First Men on the Moon151

Unit Forty-seven Social Facts153

Passage 1 Bells on Your Ears153

Passage 2 The Rain Dance?155

Passage 3 Can You Vote?157

Passage 4 Rich Countries and Poor Countries159

Unit Forty-eight Schools and Education161

Passage 1 Why Do Children Go to School?161

Passage 2 Early American Schools164

Passage 3 The School onWheels167

Passage 4 Book in Chains169

Unit Forty-nine Trade171

Passage 1 Let's Trade171

Passage 2 Stone Money,Feather Money173

Passage 3 Walking,Talking Ads175

Passage 4 Different Kinds of Money177

Unit Fifty Communication180

Passage 1 Forms of Communication180

Passage 2 Radio183

Passage 3 Send a Message186

Unit Fifty-one Festivals188

Passage 1 Christmas Day188

Passage 2 Spring Festival191

Passage 3 April 1st193

Passage 4 New Year's Eve195

Unit Fifty-two Signs198

Passage 1 Signs in the Desert198

Passage 2 Something for Nothing200

Passage 3 Sign Language201

Unit Fifty-three Primitive Methods of Counting204

Passage 1 A Stone for Sheep204

Passage 2 A Dusty Way to Count206

Passage 3 The Rope Stretchers208

Passage 4 The Year That the Barn Burned Down210

Unit fifty-four Modern Technology212

Passage 1 The Machine That Knows the Answers212

Passage 2 The Structure of a Computer214

Passage 3 Telephone216

译文219

词汇282

Unit One About Myself1

Passage 1 My Family1

Passage 2 My Room3

Passage 3 My Foreign Friends5

Passage 4 Our House7

Unit Two Our School9

Passage 1 Our Classroom9

Passage 2 Our School Garden11

Passage 3 Our English Teacher13

Passage 4 Our Library15

Unit Three Learning English17

Passage 1 The English Language17

Passage 2 Two Languages Or One20

Passage 3 How to Use a Dictionary22

Unit Four The United States24

Passage 1 The Early Days of the United States24

Passage 2 Schools in the U.S27

Passage 3 The Climates of the United States30

Passage 4 The Capital of the United States32

Unit Five The United Kindom36

Passage 1 The Weather in England36