致学生
致老师
1 A Using Energy to Ride a Bike
1 B Fixing a Flat
2 A Animals of the Forests
2 B A Listening Walk in the Forest
3 A The Constellations
3 B A Visit to a Planetarium
4 A The Need for Plants
4 B Grow Your Own Vegetables
5 A What Is a Veterinarian?
5 B Are Dogs Getting Healthier?
6 A The Features of Earth's Surface
6 B Down the Mississippi River
7 A Simple Machines
7 B A Simple Solution
8 A The Scientific Discoveries of Benjamin Franklin
8 B How Do Kites Fly?
9 A The Truth About Sharks
9 B The Crittercam
10 A Types of Clouds
10 B Meteorologists Predict the Weather
11 A Fruits and Vegetables: A Key to Good Health
11 B Exotic Fruits
12 A Crossing the Land with Steam Power
12 B Robert Fulton and the Steamboat
13 A Seasons Around the World
13 B Staying Warm in Winter
14 A What Is a Mammal?
14 B Mammals with Pouches
15 A How to Organize a Great Science Fair Project
15 B A Tasteful Science Experiment
16 A Rocks and Minerals
16 B The Hope Diamond
17 A Water Is Needed for Life
17 B How Cacti Survive with Little Water
18 A Flowering and Nonflowering Plants
18 B The Honeybee and Pollination
19 A Waste and Recycling :
19 B Our Class Recycling Project
20 A Elijah McCoy, Inventor
20 B Why Do We Say That?
21 A The Push and Pull of Magnets
21 B Making Magnets
22 A The Senses
22 B A Fish Out of Water
23 A Telescopes and Microscopes
23 B An Important Scientist
24 A The Life Cycle of a Tree
24 B Growing Applesauce
25 A How Animals Defend Themselves
25 B Animals Keeping Clean
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