Preface
Lessons
1 Using Energy to Ride a Bike
2 Animals of the Forests
3 The Constellations
4 The Need for Plants
5 What Is a Veterinarian？
Vocabulary Assessment 1-5
6 The Features of Earth's Surface
7 Simple Machines
8 The Discoveries of Benjamin Franklin
9 The Truth About Sharks
10 Types of Clouds
Vocabulary Assessment 6-10
11 A Key to Good Health
12 Crossing the Land with Steam Power
13 Seasons Around the World
14 What Is a Mammal？
15 Organizing a Science Project
Vocabulary Assessment 11-15
16 Rocks and Minerals
17 Water Is Needed for Life
18 Flowering and Nonflowering Plants
19 Waste and Recycling
20 Elijah McCoy， Inventor
Vocabulary Assessment 16-20
Glossary
Personal Dictionary
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