21世纪科技英语 上PDF电子书下载

Unit 1 1

Text A Bill Gates' Speech to Tsinghua University(12December,1997) 1

Text B US Plans Large Funding Boost to Support Nanotechnology Boom 7

STYLISTICS Features of EST in Style and Structure(1) 10

Unit 2 15

Text A Information Management:Definitions and Some Aspects of It 15

Text B CGS-Unit System 26

Unit 3 31

Text A Genetic Engineering 31

Text B Introduction to the Human Genome Project 35

STYLISTICS Features of EST in Style and Structure(2) 39

Unit 4 43

Text A The Development of Mobile Communications in Cellular Phones 43

Text B Practical Electric Units and the Giolgi Proposal 51

Unit 5 57

Text A How IC Products Are Made? 57

Text B The Metric Convention 66

STYLISTICS Grammatical Features of EST:Modal Verbs ＆ Post-modifiers 70

Practice Exercise Ⅰ 75

Text A Major Research Areas in Physics Today 87

Unit 6 87

Text B The Significance of Measurement and Its Physically Developing 94

Unit 7 99

Text A Computer Crime—Congress vs.Computer Crime 99

Text B The International Bureau of Weights and Measures 108

STYLISTICS Grammatical Features of EST:Voice ＆ Mood 111

Unit 8 121

Text A The Top 10 Innovative Products for 2006 121

Text B The Bioinformatics Gold Rush 134

Text A GPS 143

Unit 9 143

Text B The Greatest Extinction Gets Greater 149

STYLISTICS Grammatical Features of EST:Tense 158

Unit 10 163

Text A The Lamb That Roared 163

Text B Dick Whitcomb 175

Practice Exercise Ⅱ 183

Key to Exercises 195

Glossary 209