Unit 1 It's a Small World
Chapter 1 My Hometown
Chapter 2 Countries
Chapter 3 Famous Cities
Unit 2 Going on a Trip
Chapter 4 Planning for a Trip
Chapter 5 At the Train Station
Chapter 6 A Trip to Xi'an
Unit 3 Our World
Chapter 7 Land and Sea
Chapter 8 Nature Walk
Chapter 9 Earth Day
Unit 4 Animal Kingdom
Chapter 10 Wild Animals
Chapter 11 The Food Chain
Chapter 12 At the Zoo
Writing
Answer Key
