英语 2PDF电子书下载

CONTENTS 1

Lesson One 1

Text：Gravity 1

Grammar：Ⅰ．句子的种类 5

Ⅱ．状语从句（一） 6

Reading Material: Gravity and Spaceship 16

Lesson Two 18

Text：The Sun，the Moon and the Stars 18

Grammar：Ⅰ．形容词和副词的级 23

Ⅱ．状语从句（二） 26

Reading Material：Evaporation 33

Lesson Three 35

Text：Science and Facts 35

Grammar：主语从句，表语从句，宾语从句，同位语从句 41

Reading Material：Magnets 48

Lesson Four 50

Text：A Common Element 50

Grammar： What引导的从句 56

Reading Material：Air Pressure 60

Text： Light 62

Lesson Five 62

Grammar：定语从句（一） 67

Reading Material： Atoms 77

Lesson Six 79

Text：Cloud，Fog and Dew 79

Grammar：定语从句（二） 85

Reading Material： How Heat Travels 91

Lesson Seven 93

Text：A Story About Edison 93

Reading Material：Different Forms of Water 108

Grammar：复习 108

Lesson Eight 110

Text： Radar for Peaceful Purposes 110

Grammar：不定式（一） 116

Reading Material：Watson-Watt and Radar 123

Lesson Nine 126

Text： Li Shi-zhen 126

Grammar：不定式（二） 131

Reading Material： When and How to Collect Herbs 138

Text：Sound Has Speed 140

Lesson Ten 140

Grammar：动名词 147

Reading Material：Iron Smelting 153

Lesson Eleven 156

Text： Computers 156

Grammar：分词（一） 162

Reading Material：Chemical Reaction in a Living Body 170

Lesson Twelve 172

Text：Fire 172

Grammar：分词（二） 180

Reading Material： Electric Current 186

Lesson Thirteen 189

Text：Science and Scientific Research 189

Grammar：复习 202

Reading Material：Molecules 202

Lesson Fourteen 205

Text：Electron and Atom 205

Grammar：虚拟语气 210

Reading Material：How to Put Out a Fire 221

Text：Something About Electrification 223

Lesson Fifteen 223

Grammar：It用法小结 228

R eading Material：How to Build a Fire 237

Lesson Sixteen 238

Text：Expansion and Contraction 238

G rammar：As用法小结 245

Reading Material：Four Zones of the Earth 255

Lesson Seventeen 257

Text：Supersonic Planes 257

Reading Material：Fission and Fusion 272

Grammar：复习 272

Supplementary Readings 275

1．Water in the Air 275

2．What Are Magnets? 277

3．Can People Really Make Rain? 280

4．Force，Work，Energy and Power 282

5．How Changes Are Brought Abou+? 284

6．China's Own Path 290

Word Study索引 298

总词汇表 302