UNIT 01 A Pot of Stone Soup UNIT 02 Berber Fantasia UNIT 03 Can We Block the Sun? UNIT 04 Dealing with a Bad Friend UNIT 05 Emoji UNIT 06 Firehawks UNIT 07 Greetings from Thailand UNIT 08 How Cooler Air Changed the World UNIT 09 In the Old Stone Age UNIT 10 Jinx! UNIT 11 Keto Diets UNIT 12 Leonard Cohen’s “Hallelujah” UNIT 13 MMA Debates UNIT 14 Naming Babies UNIT 15 Organ Transplants UNIT 16 Personality and Birth Order UNIT 17 Quinceanera UNIT 18 Railroad across Siberia UNIT 19 Salinger: A Life in Private UNIT 20 The Evolution of Dogs UNIT 21 Unschooling UNIT 22 Voice Acting UNIT 23 Yawning Cools Us UNIT 24 Zombies: Why So Popular? [책속책] 정답 및 해설