Unit 1 1
Text 1 Bird Flu in Hong Kong 4
Unit 2 8
Text 2 Internet in Malaysia 12
Unit 3 16
Text 3 Street Food Safety 20
Unit 4 25
Text 4 Stop Smoking 29
Unit 5 34
Text 5 Oral Health Study 38
Unit 6 43
Text 6 Cars and Crops 46
Unit 7 51
Text 7 Salt-Resistant Tomato 55
Unit 8 59
Text 8 Growing Carrots 63
Unit 9 68
Text 9 Christmas Day 71
Unit 10 75
Text 10 Santa Claus 79
Unit 11 83
Text 11 Robotic Surgery 87
Unit 12 92
Text 12 Tiny Transistor 97
Unit 13 101
Text 13 National Virtual Observatory 105
Unit 14 109
Text 14 Fuel Cell Cars 113
Unit 15 117
Text 15 Safe Blood 121
Unit 16 126
Text 16 Light Pollution 130
Unit 17 135
Text 17 Earth Day 2000 140
Unit 18 144
Text 18 AIDS in the United States 149
Unit 19 153
Text 19 Rice Plant Gene Map 157
Unit 20 162
Text 20 Information Technology for Poor Nations 166
Unit 21 170
Text 21 Green Cities 174
Unit 22 179
Text 22 Population and the Environment 184
Unit 23 188
Text 23 Genetic crops increasing 192
Unit 24 197
Text 24 Early Plant Study 201
Unit 25 206
Text 25 Plants that Absorb Metals 210
Unit 26 214
Text 26 Bats 219
Unit 27 223
Text 27 WHO and Drug Resistance 227
Unit 28 231
Text 28 Federal Reserve 235
Unit 29 240
Text 29 World Trade Organization 244
Unit 30 249
Text 30 Enron Fails 253
Unit 31 258
Text 31 Halloween(1) 262
Unit 32 267
Text 32 Halloween(2) 271
Unit 33 275
Text 33 Halloween(3) 279
Unit 34 284
Text 34 Thanksgiving(1) 288
Unit 35 292
Text 35 Thanksgiving(2) 296
Unit 36 300
Text 36 Thanksgiving(3) 304
Unit 37 309
Text 37 Lincoln Portrait 313
Unit 38 319
Text 38 Literacy 323
Unit 39 330
Text 39 History of English Language,Part 1 334
Unit 40 341
Text 40 History of English Language,Part 2 345
References（参考资料） 352