Unit 1 Text - 1 How the Automobile Shaped America： The 'Burbs
Text - 2 America's Love Affair with the Car Is Fading
Text - 3 Henry Ford， the Man Who Changed America
Text - 4 Memory Lane Isn't What It Used to Be

Unit 2 Text - 1 The Teenager．Who Saved a Man with an SS Tattoo
Text - 2 Two 7-Year-Old Boys， Two Dramatically Different News Stories
Text - 3 That Black Southern Man and That White Northern Girl?
Text - 4 She Wanted to Teach

Unit 3 Text - 1 The History and Development of Suburbs
Text - 2 The End of the Suburbs
Text - 3 Cities： How Crowded Life Is Changing Us
Text - 4 Black Box Tells Its Secrets

Unit 4 Text - 1 Carl Sagan and the Cosmos Legacy
Text - 2 The Hubble Telescope
Text - 3 Everything Equals E = mc2
Text - 4 Black Holes

Unit 5 Text - 1 The Modern Workplace： Flat， Flexible， and Wired Up
Text - 2 Older Workers Transform the Modern Workplace
Text - 3 Two Kinds of Buyers
Text - 4 The Economics of Product Design

Unit 6 Text - 1 The Meaning of Friendship in a Social Networked World
Text - 2 How Does Social Media Affect Our Relationships?
Interpersonal Communication in the Digital Age
Text- 3 The Gift
Text - 4 Linda's New Friend

Unit 7 Text- 1 New Grads Drawn to New Businesses
Text - 2 How Paperbacks Transformed the Way Americans Read
Text - 3 A Decidedly Mixed Bag
Text - 4 The Carpet Fitter

Unit 8 Text - 1 Are Dolphins Also Persons?
Text - 2 Well， Who's a Clever Species， Then?
Text - 3 Do You Know Why We See Snow as White?
Text - 4 Flowers in the Desert?

Appendix Key to Comprehension Exercises