Unit One Matching the Headings 1
Exercise 1 A Giant Step for Artificial Enzymes 6
Exercise 2 More Than Sympathy 8
Exercise 3 Energy from Biological Sources 11
Exercise 4 Sleeping Secrets 15
Exercise 5 It Never Rains 18
Exercise 6 Farmers Harvest the Wind 22
Exercise 7 Germs and Sickness in a Shrinking World 25
Exercise 8 On the Wing 28
Unit Two Cloze 32
Exercise 1 Standards of Measurement 35
Exercise 2 The Function of Carbon Dioxide in the Atmosphere 36
Exercise 3 The Properties of Systems in the Human Body 38
Exercise 4 Analysis and Synthesis 39
Exercise 5 The Properties of Elements,Compounds and Mixtures 41
Exercise 6 The Structure of the Earth 42
Exercise 7 The Carbon Cycle 43
Exercise 8 Vitamins 45
Exercise 9 Thermostats 46
Exercise 10 Pressure 48
Exercise 11 Space and Distance 49
Exercise 12 The Theory of Emotion 51
Exercise 13 Physical Characteristics 52
Exercise 14 Attitude Functions 53
Exercise 15 Functions of Leadership 55
Unit Three Multiple Choice 57
Exercise 1 Are You a Machine of Many Parts? 63
Exercise 2 Making Allowances for Your Kids'Dollar Values 67
Exercise 3 The Lost City of DeMille Emerges from the Desert Sands of California 70
Exercise 4 Separate,but EQ 73
Unit Four Summarizing 75
Exercise 1 Adapting to Road Conditions 79
Exercise 2 Biogas：a Solution to Many Problems 81
Exercise 3 A 19th Century Killer Disease：Tuberculosis 83
Exercise 4 For Each Astronaut,a"Buddy" 85
Exercise 5 Management in Cyberspace 88
Exercise 6 Our Dying Seas 90
Exercise 7 Ethics and Archaeology 94
Unit Five YES/NO/NOT GIVEN 97
Exercise 1 The World of the Flat-footed Fly 102
Exercise 2 Energy,Fission and Fusion 105
Exercise 3 Will Britain Turn Its Back on Wave Power? 109
Exercise 4 Talk to Kids about Drugs?Parents Just Don't Do It 112
Exercise 5 A New Learning Tool 116
Exercise 6 Ill Winds 119
Exercise 7 Stufied 122
Exercise 8 Brain Drain 124
Exercise 9 Morphing Winglets Make for Greener Aircraft 129
Exercise 10 Transporter of Delight 132
Unit Six Scanning for Answers 136
Exercise 1 Batteries Now Included 140
Exercise 2 A Light Bulb that Lasts 143
Exercise 3 Elemental Clues to a Galaxy's Past 145
Exercise 4 Vital Role in World Airline Industry 148
Exercise 5 Tough Sensor Can Take the Heat 152
Exercise 6 Model Atmosphere Show Signs of Life 154
Exercise 7 Tree Rings Are Laying Bare the Climatic History of Asia 158
Unit Seven Integrated Exercises 160
Exercise 1 Museums Are Showing off the Stuff in the Attic 165
Exercise 2 A Sense of Crisis 168
Exercise 3 Carcinogenic Dye in Hundreds of Food Products 173
Exercise 4 Saving the Seahorses 176
Exercise 5 Deadly Illusion Brings Death on the Road 180
Exercise 6 How Safe Are Air Bags? 183
Exercise 7 Expanding Consciousness 186
Exercise 8 A Harebrained Scheme 189
Exercise 9 Hypnosis 193
Exercise 10 Metal Compounds Which Break the Rules 196
Unit Eight Practice Tests 199
PRACTICE TEST（Version One） 201
PRACTICE TEST（Version Two） 213
PRACTICE TEST（（Version Three） 225
PRACTICE TEST（Version Four） 237
PRACTICE TEST（（Version Five） 250
PRACTICE TEST（Version Six） 262
PRACTICE TEST（Version Seven） 274
Answer Key 285
Appendices 297
1．A Brief Introduction to the IELTS Test 297
2．IELTS Reading Answer Sheet 301