基础科技英语教程PDF电子书下载

UNIT 1 SIMPLE PRESENT ACTIVE 1

UMT 2 SIMPLE PRESENT PASSIVE 16

UNIT 3 SIMPLE PAST ACTIVE AND PASSIVE 30

UNIT 4 -ing FORMS I 45

UNIT 5 REVISION OF UNITS 1—4 61

UNIT 6 PRESENT PERFECT；PRESENT CONTINUOUS 75

UNIT 7 INFlNITIVES；-ing FORMSⅡ 94

UNIT 8 ANoMALOUS FINITES 115

UNIT 9 PAST PERFECT；CONDITIONALS 140

UNIT 10 REVISION OF UNITS 6-9 166

UNIT 11 GENERAL REVISION UNIT 184

UNIT 12 GENERAL REVISION UNIT 207

APPENDIX A COMMON PREFIXES AND SUFFIXES 235

APPENDIX B COMMON ABBREVIATIONS 246

APPENDIX C BASIC WORDS 249

APPENDIX D KEY TO EXERCISES 351