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Unit 1
Text-1 How the Automobile Shaped America£º 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£º 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£º 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 Comm
Unication 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
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