英语教程 理工科用 第4册PDF电子书下载

Lesson One 2

Lesson Two 11

Lesson Three 21

Lesson Four 35

Lesson Five 47

Lesson Six 61

Lesson Seven 73

Lesson Eight 85

Lesson Nine 100

Lesson Ten 117

Lesson Eleven 133

Lesson Twelve 151

SUPPLEMENTARY READINGS 170

Ⅰ Why Read Faster? 170

Ⅱ Introduction 174

Ⅲ Filmless Cameras May Lead Next Boom in Photography 181

Ⅳ Interest Is Growing in Plastics That Can Conduct Electricity 185

Ⅴ The Age of the Sun 188

Ⅵ Big Numbers and Infinities 192

Ⅶ Too Many People? 200

Ⅷ Scientific Knowledge and the Young Scientist 206

Ⅸ Gettysburg Address 212

Ⅹ Dr.Bethune Speaks at the Opening of a New Army Hospital 214

APPENDIXES APPENDIX Ⅰ 220

1．Business Letters 220

2．Abstracts 224

3．Book Reviews 226

4．Instructions to Experiments 231

5．Laboratory Reports 238

6．Instruction Manual 250

APPENDIX Ⅱ 260

Irregular Verbs 260

APPENDIX Ⅲ 261

Vocabulary 261