1 A The History of Printing 1
1 B The Book and Electronic Publishing 3
2 A The Weathering and Erosion of Rock 5
2 B Weather Forecasting Through the Ages 7
3 A Space,Time,and Gravitation 9
3 B Albert Einstein 11
4 A Power and Leadership in the Wolf Pack 13
4 B The Mysterious Nature of Wolves 15
5 A Producers and Consumers:The Food Chain 17
5 B Nature's Pesticides 19
6 A What Is Stress? 21
6 B Stress Management 23
7 A Air and Water Pollution 25
7 B Rachel Carson,Scientist and Writer 27
8 A The Scientific Method 29
8 B Scientific Observations and Photography 31
9 A The Sounds of Music 33
9 B Music Across Cultures 35
10 A Technology and the History of Communications 37
10 B Cryptography and Cryptology:Figure It Out 39
11 A Transparency:Seeing Through It 41
11 B Stained Glass:The Creation of Color 43
12 A Fall Foliage 45
12 B The Autumnal Equinox 47
13 A The Life Cycle of the Barnacle 49
13 B Watch Out for Some Marine Life 51
14 A Digging Up Our Past:Archaeology 53
14 B The Archaeological Process:Doing the Dig 55
15 A Hippocrates and the Symptoms of Disease 57
15 B The Controversy over Herbal Medicines 59
16 A The Respiratory System 61
16 B Taking Care of the Lungs 63
17 A Life in Antarctica 65
17 B Icebergs of the Arctic Ocean 67
18 A Bats 69
18 B Bats and the Carlsbad Caverns National Park 71
19 A Rain Forests 73
19 B Saving the Rain Forest 75
20 A The Human Genome Project 77
20 B Ethics and the Human Genome Project 79
21 A What Is Physics? 81
21 B The Physics of Tennis 83
22 A The Development of Multimedia 85
22 B Virtually Real 87
23 A Condensation and Evaporation 89
23 B An Experiment:Distilling Water 91
24 A Earth's Atmosphere 93
24 B The Ozone Layer 95
25 A Flower and Plant Reproduction 97
25 B Flowers of the Desert 99
附录 101
Answer Key 101
Reading Rate 103
Comprehension Score 104
Comprehension Skills Profile 105