Unit One The Things Unknown to You 1
Reading Selection 1
Language Structure 10
The Use of“It”（“It”的用法） 10
Practice and Improvement 14
Unit Two Fight Against AIDS 28
Reading Selection 28
Language Structure 41
Direct Speech＆Indirect Speech（直接引语和间接引语） 41
Practice and Improvement 47
Unit Three Energy Sense Makes Future Sense 62
Reading Selection 62
Language Structure 72
The Subjunctive Mood（虚拟语气） 72
Practice and Improvement 78
Unit Four The Cloning Technology 94
Reading Selection 94
Language Structure 105
The Agreement（一致关系） 105
Practice and Improvement 112
Revision Ⅰ 125
Unit Five Advertising and Advertisements 136
Reading Selection 136
Language Structure 146
Word Formation（构词法） 146
Practice and Improvement 152
Unit Six Computers Concerning You 167
Reading Selection 167
Language Structure 178
Inversion（倒装） 178
Practice and Improvement 183
Unit Seven The Internet Concerning You 199
Reading Selection 199
Language Structure 209
Preposition（介词） 209
Practice and Improvement 214
Unit Eight International Trade 229
Reading Selection 229
Language Structure 241
The Passive Voice（被动语态） 241
Practice and Improvement 246
Revision Ⅱ 262
Appendixes 274
Appendix Ⅰ Glossary 274
Appendix Ⅱ Idioms and Expressions 294