Unit OneSection A What's in a Hobby？ 173
Section B Railroading Is a Most Exciting Hobby 183
Section C How I Killed off My Ex-Wife 191
Section D Writing ＆ Translation 194
Unit TwoSection A Just Do It 195
Section B Chinese and U.S.Clothes Shoppers 207
Section C Extreme Green 214
Section D Writing ＆ Translation 216
Unit ThreeSection A Mother Tongue 218
Section B Conversational Ball Games 229
Section C The Vietnamese Are ahead in the Race 237
Section D Writing ＆ Translation 239
Unit FourSection A Our International Love Story 241
Section B Love Finds a Way：Spencer Tracy and Katherine Hepburn 253
Section C Taboo Tabu：A Story of Multicultural Love and Marriage 262
Section D Writing ＆ Translation 265
Unit FiveSection A Pandora's Box 266
Section B The Legend of Abraham Lincoln's Beard 279
Section C Phantom Hitchhikers 286
Section D Writing ＆ Translation 288
Unit SixSection A History Speaks 289
Section B Jimmy Carter's Experiences during the Great Depression 300
Section C A Tale of Two Ancient Civilizations：Greece and Rome 308
Section D Writing ＆ Translation 310
Unit SevenSection A Technology that Changed Our Lives 311
Section B Artificial Intelligence：Alive and Well 321
Section C Pros and Cons of Hybrid Cars 328
Section D Writing ＆ Translation 330
Unit EightSection A Top 8 Mysteries of the Universe 332
Section B Does Dark Energy Really Exist？ 345
Section C What Is the Butterfly Effect？ 352
Section D Writing ＆ Translation 354