1 A Rain Forests: Tropical and Temperate 1
1 B Manaus: City in the Amazon Rain Forest 3
2 A The Science of Navigational Sailing 5
2 B The Astrolabe 7
3 A Sculpture on a Grand Scale 9
3 B Elemental Expression 11
4 A The Milky Way 13
4 B Globular Star Clusters 15
5 A Properties of Snow 17
5 B Surviving Blizzards 19
6 A Renewable Energy Sources 21
6 B The Hoover Dam 23
7 A Penicillin: The Wonder Drug 25
7 B Bacteria 27
8 A Urban Sprawl 29
8 B Environmental Architecture 31
9 A Sea Otters 33
9 B Smart Creatures 35
10 A Two Kinds of Forests 37
10 B The Colorful Deaths of Leaves 39
11 A Desert Biomes 41
11 B The Saguaro Cactus 43
12 A The Artist and Light 45
12 B Theatrical Lighting and Design 47
13 A Amphibians 49
13 B Frog Food 51
14 A The Water Cycle 53
14 B Rainmaker: An Experiment 55
15 A Wetlands 57
15 B The Benefits of Wetlands 59
16 A Glaciers 61
16 B The Ice Age 63
17 A Careers in Zoology 65
17 B The Daily Care of Zoo Animals 67
18 A Heredity and Genetics 69
18 B Identical and Fraternal Twins 71
19 A Computers and the Information Revolution 73
19 B Voice Synthesizers 75
20 A Hidden Animals 77
20 B The Misunderstood Chameleon 79
21 A The Life Cycle of a Flowering Plant 81
21 B The Sea Anemone 83
22 A Earthquakes 85
22 B Tectonic Plates and Earthquake Geography 87
23 A Memory and the Brain 89
23 B Left Brain vs.Right Brain 91
24 A Optical Illusions 93
24 B What Is a Mirage? 95
25 A The Dandelion 97
25 B Natural Superstitions 99
附录 101
Answer Key 101
Reading Rate 103
Comprehension Score 104
Comprehension Skills Profile 105