致学生
致老师
1 A The History of Space Travel
1 B Neil Armstrong： First Person on the Moon
2 A What Is a Botanist?
2 B Do Plants Feel Pain?
3 A Lakes and Rivers
3 B Cleaning Up Rivers
4 A How Flight Is Possible
4 B Helicopters： Form and Function
5 A Earths Layers
5 B Making a Model of Earths Layers
6 A The Nobel Prizes
6 B Doctors Without Borders
7 A The Organs of the Body
7 B The Importance of Water in the Body
8 A Technology for People with Hearing or Visual Impairments
8 B Learning Sign Language
9 A The Importance of Vitamins and Minerals
9 B The Truth About Vitamin C
10 A Gymnastics： A Sport of Balance
10 B Training to Be a Gymnast
11 A Growing Plants from Seeds— Guaranteed!
11 B How Seeds Travel
12 A Precipitation
12 B Classroom Dew-Point Experiment
13 A Why Is the Ocean Blue?
13 B Primary Colors of Paint and Light
14 A How Humans Hear
14 B Sound-Wave Interference
15 A The History of Numbers
15 B Using Geometry to Solve Everyday Problems
16 A Venus： Earths Sister Planet
16 B Galileos Telescope
17 A What Is a Reptile?
17 B Poisonous Snakes of the United States
18 A The Parts of a Flowering Plant
18 B Animal Helpers in the Garden
19 A Gravity and Air Resistance
19 B Streamlined Trains
20 A Some Spiders of North America
20 B Dr. Charles Turner， Zoologist
21 A Plants and Animals in Ponds
21 B What Is an Ecosystem?
22 A Computer Memory and Storage
22 B From Punch Cards to DVDs
23 A Signs of Spring
23 B Josephs Nature Journal
24 A Stone， Brick， and Concrete
24 B Building the Brooklyn Bridge
25 A The Tropical Rainforest Biome
25 B Saving the Rain Forest
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