Lesson One 2
Text：Can a Computer Think？ 2
Lesson Two 11
Text：Star Wars—and Einstein 11
Lesson Three 21
Text：Are There Strangers in Space？ 21
Lesson Four 35
Text：Noise and the Worker 35
Lesson Five 47
Text：Alfred Nobel—a Man of Contrasts 47
Lesson Six 61
Text：The Years of the Quies Sun 61
Lesson Seven 73
Text：A Visitor from the Past 73
Lesson Eight 85
Text：The Discovery of Radioactivity 85
Lesson Nine 100
Text：Transport in the Future：Air or Sea？ 100
Lesson Ten 117
Text：Saving the Left-overs 117
Lesson Eleven 133
Text：A Robot about the House 133
Lesson Twelve 151
Text：Metals in the Electronic Age 151
SUPPLEMENTARY READINGS 170
Ⅰ Why Read Faster？ 170
Ⅱ Introdtiction 174
Ⅲ Filmless Cameras May Lead Next Boom in Pho-tography 181
Ⅳ Interest Is Growing in Plastics That Can Con-duct Electricity 185
Ⅴ The Age of the Sun 188
Ⅵ Big Numbers and Iafinities 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 219
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