CONTENTS 1
Lesson One 1
Lesson Two 19
Lesson Three 41
Lesson Four 62
Lesson Five 83
Lesson Six 105
RECORDER 128
Lesson Seven 128
REVIEW（Lessons 1—7） 154
Lesson Eight 167
Lesson Nine 193
Lesson Ten 218
Lesson Eleven 243
Lesson Twelve 266
Lesson Thirteen 292
Lesson Fourteen 314
REVIEW（Lessons 8—14） 335
SUPPLEMENTARY READING 347
1．LAWS OF MOTION 347
2．PURE AND APPLIED SCIENCE 350
3．CAUSES OF CHANGING WEATHER 353
4．NATURAL PEST CONTROL 356
5．GO TO THE ANT 360
6．HOW TELEVISION WORKS 364
7．THE MARVEL OF THE MACHINE AGE 368
8．PANDAS 372
9．HE CALLED IT PENICILLIN 375
10．MINIATURIZATION 380
11．OPTIMIZATION 383
12．VOLCANOES 386
13．MAN ON THE MOON 390
14．AERODYNAMICS 394
15．RADAR 398
16．OIL 403
17．LASERS 408
18．NUCLEAR POWER 412
APPENDIX Ⅰ：英译汉常识 416
APPENDIX Ⅱ：构词法 428
APPENDIX Ⅲ：常用数学符号和数学式的读法 433
APPENDIX Ⅳ：常用不规则动词表 437
VOCABULARY 439