英语 2PDF电子书下载

CONTENTS 1

Lesson One 1

Text:Gravity 1

Grammar：Ⅰ．句子的种类 4

Ⅱ．状语从句（一） 6

Reading Material:Gravity and Spaceships 17

Lesson Two 20

Text:The Sun,the Moon and the Stars 20

Grammar：Ⅰ．形容词和副词的级 25

Ⅱ．状语从句（二） 28

Reading Material:Evaporation 34

Lesson Three 37

Text:Science and Facts 37

Grammar：主语从句，表语从句，宾语从句，同位语从句 43

Reading Material,Magnets 51

Lesson Four 54

Text:A Common Eiement 54

Grammar：What引导的从句 60

Reading Material:Air Pressure 65

Text:Light 68

Lesson Five 68

Grammar：定语从句（一） 73

Reading Material:Atoms 83

Lesson Six 86

Text:Cloud,Fog and Dew 86

Grammar：定语从句（二） 92

Reading Material:How Heat Travels 98

Lesson Seven 101

Text:A Story About Edison 101

Reading Material:Different Forms of Water 115

Grammar：复习 115

Lesson Eight 118

Text:Radar for Peaceful Purposes 118

Grammar：不定式（一） 124

Reading Material:Watson-Watt and Radar 132

Lesson Nine 135

Text:Li Shi-zhen 135

Grammar：不定式（二） 140

Reading Material:When and How to Collect Herbe 148

Text:Sound Has Speed 151

Lesson Ten 151

Grammar：动名词 158

Reading Material:Iron Smelting 164

Lesson Eleven 167

Text:Computers 167

Grammar：分词（一） 174

Reading Material:Chemical Reaetion in a Living Body 181

Lesson Twelve 184

Text:Fire 184

Grammar：分词（二） 192

Reading Material:Electric Current 198

Lesson Thirteen 201

Text:Science and Scientific Research 201

Grammar：复习 213

Reading Material:Molecules 213

Lesson Fourteen 216

Text:Electron and Atom 216

Grammar：虚拟语气 221

Reading Material:How to Put Out a Fire 232

Text:Something About Electrification 236

Lesson Fifteen 236

Grammar：It用法小结 241

Reading Material:How to Build a Fire 249

Lesson Sixteen 252

Text:Expansion and Contraction 252

Grammar：As用法小结 259

Reading Material:Four Zones of the Earth 269

Lesson Seventeen 272

Text:Supersonic Planes 272

Reading Material:Fission and Fusion 286

Grammar：复习 286

Supplementary Readings 290

Ⅰ．Water in the Air 290

Ⅱ．What Are Magnets? 294

Ⅲ．Can People Really Make Rain? 297

Ⅳ．Force,Work,Energy and Power 300

Ⅴ．How Changes Are Brought About? 303

Ⅵ．Water Resources 309

复习测验题Review Test 319

“Word Study”索引 338

总词汇表 342