科技英语自学课本 下PDF电子书下载

Lesson 1 1

Text:How Nature Breaks Rocks 1

Reading Materials 9

Ⅰ．Weight On and Off the Earth 9

Ⅱ．Falling Bodies and Their Weight 14

Lesson 2 17

Text:Star Wars-and Einstein 17

Reading Materials 25

Ⅰ．Atomic Clocks 25

Ⅱ．Physical and Chemical Changes 28

Lesson 3 31

Text:Christopher Columbus 31

Reading Materials 39

Ⅰ．Columbus and America 39

Ⅱ．The Travels ofMarco Polo 42

Lesson 4 46

Text:Plants 46

Reading Materials 53

Ⅰ．Save the World 53

Ⅱ．Early Plant Life-the Algae 55

Lesson 5 58

Text:Spare Parts for Human Body 58

Reading Materials 66

Ⅰ．What Is Cancer? 66

Ⅱ．Permeability 69

Lesson 6 72

Text:Temperatures and Thermometers 72

Reading Materials 81

Ⅰ．What Is Heat? 81

Ⅱ．Can We'Make'Energy? 84

Lesson 7 86

Text:Animals in Danger 86

Reading Materials 93

Ⅰ．Why Does a Male Bird Have Brightercolors than the Female? 93

Ⅱ．Food Chains 96

Lesson 8 98

Text:Dealing with Radiation Dangers 98

Reading Materials 105

Ⅰ．Matter and Energy 105

Ⅱ．Radiant Energy 109

Lesson 9 112

Text:Through the Earth's Crust 112

Reading Materials 120

Ⅰ．The Interior of the Earth 120

Ⅱ．Mineral Oil 124

Lesson 10 128

Text:Refrigeration and Refrigerators 128

Reading Materials 135

Ⅰ．How Does a Refrigerator Produce Cold? 135

Ⅱ．Protection of Food Against Bacterial Action 138

Lesson 11 141

Text:A Warmer or A Colder Earth? 141

Reading Materials 148

Ⅰ．Climate and Vegetation 148

Ⅱ．What People Don't Know about Air 151

Lesson 12 155

Text:The Value of Transistors 155

Reading Materials 163

Ⅰ．Microelectronics 163

Ⅱ．Transistor 166

Lesson 13 170

Text:Alfred Nobel-A Man of Contrasts 170

Reading Materials 178

Ⅰ．How Scientists Work 178

Ⅱ．Abilities 182

Lesson 14 187

Text:Metals and Ores 187

Reading Materials 196

Ⅰ．How We Use Metals 196

Ⅱ．Hot Metal 200

Lesson 15 203

Text:The Story of Eyes 203

Reading Materials 211

Ⅰ．Can Animals See in Color? 211

Ⅱ．Bees and Colour 214

Vocabulary 217