Unit Seventeen The More We Learn，the Less We Know 1
Part A：Cosmic Uncertainty 1
ContentsIntroduction for Students 1
Acknowl edgements to Publishers 3
What Do We Know about How People Read？ 6
Part B：Last Chance for Halley’s 7
Building Reading Power 9
Building Reading Power 10
Building Reading Power 11
Building Reading Power 12
Building Reading Power 13
Building Reading Power 14
Building Reading Power 15
Timed Reading：The End of the World？No，the Chance of a Lifetime 15
Building Reading Power 16
Unit Eighteen：Second-Class Citizens？ 25
Part A：Computers：A Male Culture？ 25
Part B：Girls Don’t Like Macho Games！ 31
Timed Reading：Computers Are for Everyone 39
Recognizing Fact and Opinion 53
Unit Nineteen：NASA：The Inside Story 61
Part A：The Universe at Our Fingertips 61
Timed Reading：Communication：Tracking the Data 72
Unit Twenty：The Lonel iness of the Long-Distance Astro-naut 81
Part A：The Salyut Experience 81
Part B：Psychological Support 87
Timed Reading：Al l the Comforts of Home 95
Writing Summaries and Abstracts 108
Part A：The Tortoise and the Hare 114
Unit Twenty-One：Moscow’s Drive to Seize the Edge in Space 114
Timed Reading：Cooperation for Progress 123
Part A：Tragedy on the Road to Space 133
Unit Twenty-Two：Putting the Future on Hold 133
Part B：New Frontiers Delayed 138
Timed Reading：NASA Changes Discourage Space Research 148
Finding Key Words to Buil d Speed and Comprehens-ion 164
Unit Twenty-Three：Animal s in Research：The Case for Experimentation 168
Part A：Why Not Use Animals？ 168
Timed Reading：Moral Responsibil ity 178
Part A：Stepping out with the Elephants 189
Unit Twenty-Four：Giants of Land and Sea 189
Part B：Whales and Whaling 195
Timed Reading：Redmond Comes out of Cave to Lecture on African Elephants 204
Quizzing Yourself on What You Read 211
Unit Twenty-Five：Making a Chimp out of Man 215
Part A：It’s All in the Family 215
Timed Reading：Not Such Distant Cousins 228
Unit Twenty-Six：Is There a Doctor in the House？ 239
Part A：Fighting the Silent Attacker 239
Part B：Aspirin Called Aid against Second Heart Attack 246
Timed Reading：Boynton Opens Do-it-yourself Cold Clinic 253
Information-Transfer 263
Part A：The Earl y Peopl e of North America 269
Unit Twenty-Seven：Indians-The First Americans 269
Part B：Types of Indian Societies 277
Timed Reading：The Practice of Selective Borrowing 286
Unit Twenty-Eight：The First Line of Defense against Pollution：Air Qual ity Standards 297
Part A：Who Is Fighting in the Battle for Life？ 297
Part B：Can Anyone Win the Battle？ 305
Timed Reading：Carbon Monoxide 315
Reading Between the Lines 323
Part A：Part of an Evolutionary Plan？ 330
Unit Twenty-Nine：What’s in a Face？ 330
Part B：No Two Faces Are Alike 337
Timed Reading：Showing Our Emotions 351
Unit Thirty：Celebrating with a Grand Old Lady 365
Part A：America Sal utes Liberty 365
Part B：Lady Liberty’s New Look 376
Timed Reading：Liberty：Standing for the Future 386
Understanding Text Organization Can Make You a Better Reader 404
Part A：Can All the People Be Wrong？ 408
Unit Thirty-One：The Great Hudson Valley UFO Mystery 408
Timed Reading：Who is Pulling Our Legs？ 420
Unit Thrity-Two：Flying Saucers-Are They Us？ 434
Part A：Are We All Aliens？ 434
Part B：Lost in a Time Warp 444
Timed Reading：Earth-A Way Station in Time 456
Answer KeysUnit Seventeen 472
Unit Eighteen 474
Unit Nineteen 475
Unit Twenty 477
Unit Twenty-One 478
Unit Twenty-Two 480
Unit Twenty-Three 481
Unit Twenty-Four 483
Unit Twenty-Five 484
Unit Twenty-Six 486
Unit Twenty-Seven 487
Unit Twenty-Eight 489
Unit Twenty-Nine 491
Unit Thirty 493
Unit Thirty-One 494
Unit Thirty-Two 496