| 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 附录 Answer Key Reading Rate Comprehension Score Comprehension Skills Profile |
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