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Unit Seventeen The More We Learn，the Less We Know1

Part A：Cosmic Uncertainty1

ContentsIntroduction for Students1

Acknowl edgements to Publishers3

What Do We Know about How People Read？6

Part B：Last Chance for Halley’s7

Building Reading Power9

Building Reading Power10

Building Reading Power11

Building Reading Power12

Building Reading Power13

Building Reading Power14

Building Reading Power15

Timed Reading：The End of the World？No，the Chance of a Lifetime15

Building Reading Power16

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 Everyone39

Recognizing Fact and Opinion53

Unit Nineteen：NASA：The Inside Story61

Part A：The Universe at Our Fingertips61

Timed Reading：Communication：Tracking the Data72

Unit Twenty：The Lonel iness of the Long-Distance Astro-naut81

Part A：The Salyut Experience81

Part B：Psychological Support87

Timed Reading：Al l the Comforts of Home95

Writing Summaries and Abstracts108

Part A：The Tortoise and the Hare114

Unit Twenty-One：Moscow’s Drive to Seize the Edge in Space114

Timed Reading：Cooperation for Progress123

Part A：Tragedy on the Road to Space133

Unit Twenty-Two：Putting the Future on Hold133

Part B：New Frontiers Delayed138

Timed Reading：NASA Changes Discourage Space Research148

Finding Key Words to Buil d Speed and Comprehens-ion164

Unit Twenty-Three：Animal s in Research：The Case for Experimentation168

Part A：Why Not Use Animals？168

Timed Reading：Moral Responsibil ity178

Part A：Stepping out with the Elephants189

Unit Twenty-Four：Giants of Land and Sea189

Part B：Whales and Whaling195

Timed Reading：Redmond Comes out of Cave to Lecture on African Elephants204

Quizzing Yourself on What You Read211

Unit Twenty-Five：Making a Chimp out of Man215

Part A：It’s All in the Family215

Timed Reading：Not Such Distant Cousins228

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