1 A Changing Views of the Planets 1
1 B The Rings of Saturn 3
2 A Minerals and the Three Categories of Rock 5
2 B Rock Collecting 7
3 A The Ecosystem of a Pond 9
3 B An Ecosystem in a Barrel 11
4 A The Importance of Photosynthesis 13
4 B Experiment:Finding Starch in Plant Leaves 15
5 A Stormy Weather 17
5 B What Is the Eye of a Hurricane? 19
6 A Simple and Compound Machines 21
6 B Human-Powered Flying Machines 23
7 A Human Diseases 25
7 B Allergens 27
8 A The Beliefs of Aristotle 29
8 B Nicolaus Copernicus and His Heliocentric Model 31
9 A Blood and the Circulatory System 33
9 B Sickle-Cell Anemia 35
10 A Kinetic and Potential Energy 37
10 B Sports and Potential Energy 39
11 A Antibiotics 41
11 B Super-Resistant Bacteria 43
12 A How Substances Move Through Plants 45
12 B Plant Pigments 47
13 A Aquatic Biomes 49
13 B An Important Conservationist 51
14 A Robots and Humans:An Uneasy Partnership 53
14 B Using Robots in Surgery 55
15 A Kinds of Dinosaurs 57
15 B Reconstructing Dinosau rs'Movements 59
16 A Chemistry in Everyday Life 61
16 B Organic Farming 63
17 A Mayan Astronomy 65
17 B Calendars Across the Ages 67
18 A The Early Development of Meteorology 69
18 B Weather Proverbs 71
19 A The Biochemist 73
19 B The Growing Role of Genetics in Biochemistry 75
20 A The Science of Bike Riding 77
20 B Wheels and Roads 79
21 A Smell and Taste 81
21 B Balance and Dizziness 83
22 A Single-Celled Organisms 85
22 B Types of Monerans 87
23 A Wireless Communication 89
23 B The Future of Wireless Communication 91
24 A How Plants Adapt to Seasonal Change 93
24 B The Mayapple 95
25 A Volcanoes 97
25 B The Eruption of Krakatoa 99
附录 101
Answer Key 101
Reading Rate 103
Comprehension Score 104
Comprehension Skills Profile 105