科技英语PDF电子书下载

CONTENTS 1

Lesson 1 What Gives Your Skin Its Color? 1

Lesson 2 Food 5

Lesson 3 You Taste by Smelling 10

Lesson 4 Bacteria 14

Lesson 5 The History of Bicycles 19

Lesson 6 Volcanoes 24

Lesson 7 The Great Star-Wheel 30

Lesson 8 The Science Behind Weather Proverbs 35

Lesson 9 Different Ways to Tell Time 40

Lesson 10 Bees Abuzz over RoboBee 45

Lesson 11 Booming Sounds Can Damage Kids'Ears 51

Lesson 12 Animals Make Sense out of Scents 57

Lesson 13 New Devices Track Stolen Cars 62

Lesson 14 Car Runs on Fast-Food Fuel 67

Lesson 15 Smart Glass Changes Color 73

Lesson 16 Function 79

Key to Exercises 86