Lesson 1 How to Make Friends
Lesson 2 The Dragon Boat Festival
Lesson 3 High Heels
Lesson 4 The Best Age to Start a Second Language
Lesson 5 Human Migration
Lesson 6 Choosing the Right Book
Lesson 7 Human Cloning
Lesson 8 Encouraging Children's Independence
Lesson 9 The Secrets of a Very Long Life
Lesson 10 Family Planning
Lesson 11 Smoking
Lesson 12 Paradise Lost?
Lesson 13 Practicing Gratitude
Lesson 14 Women's Status
Lesson 15 What's the E-mail?
Lesson 16 Ad: Prohibited or Not?
Lesson 17 Robots
Lesson 18 A 13th Century Traveler to China Comes to Light
Lesson 19 Solar Power
Lesson 20 The Inventions of Thomas Edison
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