致学生
致老师
1 A Arctic and Alpine Tundra
1 B A Wilderness Encounter
2 A What Is Quicksand?
2 B Surviving Quicksand
3 A How We Hear
3 B Getting a Hearing Aid
4 A The Classification of Living Things
4 B Plants That Eat Insects
5 A How Sunlight Affects Health
5 B Cave Life
6 A Every Drop Counts
6 B Effects of the World s Water Situation
7 A The Endless Struggle Between Predators and Their Prey
7 B Attack—and Counterattack!
8 A Simple and Complex Carbohydrates
8 B Sensible Dieting
9 A Heat Energy at Home
9 B A Hot Air Balloon
10 A The Life Cycle of a Frog
10 B Its a Frog! No， Its a Toad!
11 A Symbiosis
11 B An Alga， a Fungus， and Two Brothers
12 A Estuaries and Their Habitats
12 B A Protected Beach
13 A Snow Travel in the Arctic
13 B Learning to Snowshoe
14 A What Is the World Wide Web?
14 B The Inventor of the World Wide Web
15 A A Hall of Gems and Minerals
15 B Mining for Diamonds
16 A Microbes and Germs
16 B Growing Bread Mold
17 A The Many Faces of Primatologists
17 B Among the Gorillas
18 A The Physics of the Plastic Flying Disc
18 B Training a Dog to Catch a Flying Disc
19 A World Population Growth and Its Effects
19 B Megacities
20 A The Relationship of Mathematics to Astronomy and Physics
20 B The Scientific Method
21 A Weather Forecasting Tools
21 B Making a Hygrometer
22 A The Machine Age in the United States
22 B Machines in the Home
23 A The History of Space Exploration
23 B Tracking Space Missions
24 A The Invention of Television
24 B The Future of Television
25 A Learning About the Ocean
25 B The Future of the Ocean
附录
Answer Key
Reading Rate
Comprehension Score
Comprehension Skills Profile
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