TPO 1，Passage 1 Timberline Vegetation on Mountains

TPO 1，Passage 2 The Origins of Theater

TPO 1，Passage 3 Groundwater

TPO 2，Passage 1 Desert Formation

TPO 2，Passage 2 The Origins of Cetaceans

TPO 2，Passage 3 Early Cinema

TPO 3，Passage 1 Architecture

TPO 3，Passage 2 Depletion of the Ogallala Aquifer

TPO 3，Passage 3 The Long-Term Stability of Ecosystems

TPO 4，Passage 1 Deer Populations of the Puget Sound

TPO 4，Passage 2 Cave Art in Europe

TPO 4，Passage 3 Petroleum Resources

TPO 5，Passage 1 Minerals and Plants

TPO 5，Passage 2 The Origin of the Pacific Island People

TPO 5，Passage 3 The Cambrian Explosion

TPO 6，Passage 1 Powering the Industrial Revolution

TPO 6，Passage 2 William Smith

TPO 6，Passage 3 Infantile Amnesia

TPO 7，Passage 1 The Geologic History of the Mediterranean

TPO 7，Passage 2 Ancient Rome and Greece

TPO 7，Passage 3 Agriculture,Iron,and the Bantu Peoples

TPO 8，Passage 1 The Rise of Teotihuacan

TPO 8，Passage 2 Extinction of the Dinosaurs

TPO 8，Passage 3 Running Water on Mars

TPO 9，Passage 1 Colonizing the Americas via the Northwest Coast

TPO 9，Passage 2 Reflection in Teaching

TPO 9，Passage 3 The Arrival of Plant Life in Hawaii

TPO 10，Passage 1 Chinese Pottery

TPO 10,Passage 2 Vaiations in the Climate

TPO 10，Passage 3 Seventeenth-Century European Economic Growth

TPO 11，Passage 1 Ancient Egyptian Sculpture

TPO 11，Passage 2 Orientation and Navigation

TPO 11，Passage 3 Begging by Nestlings

TPO 12，Passage 1 Which Hand Did They Use？

TPO 12，Passage 2 Transition to Sound in Film

TPO 12，Passage 3 Water in the Desert

TPO 13，Passage 1 Types of Social Groups

TPO 13，Passage 2 Biological Clocks

TPO 13，Passage 3 Methods of Studying Infant Perception

TPO 14，Passage 1 Children and Advertising

TPO 14，Passage 2 Maya Water Problems

TPO 14，Passage 3 Pastoralism in Ancient Inner Eurasia

TPO 15，Passage 1 Glacier Formation

TPO 15，Passage 2 A Warm-Blooded Turtle

TPO 15，Passage 3 Mass Extinctions

TPO 16，Passage 1 Trade and the Ancient Middle East

TPO 16，Passage 2 Development of the Periodic Table

TPO 16，Passage 3 Planets in Our Solar System

TPO 17，Passage 1 Europe's Early Sea Trade with Asia

TPO 17，Passage 2 Animal Signals in the Rain Forest

TPO 17，Passage 3 Symbiotic Relationships

TPO 18，Passage 1 Industrialization in the Netherlands and Scandinavia

TPO 18，Passage 2 The Mystery of Yawning

TPO 18，Passage 3 Lightning

TPO 19，Passage 1 The Roman Army's Impact on Britain

TPO 19，Passage 2 Succession,Climax,and Ecosystems

TPO 19，Passage 3 Discovering the Ice Ages

TPO 20，Passage 1 Westward Migration

TPO 20，Passage 2 Early Settlements in Southwest Asia

TPO 20，Passage 3 Fossil Preservation

TPO 21，Passage 1 Geothermal Energy

TPO 21，Passage 2 The Origins of Agriculture

TPO 21，Passage 3 Autobiographical Memory

TPO 22，Passage 1 Spartina

TPO 22，Passage 2 The Birth of Photography

TPO 22，Passage 3 Tbe Allende Meteorite

TPO 23，Passage 1 Urban Climates

TPO 23，Passage 2 Seventeenth-Century Dutch Agriculture

TPO 23，Passage 3 Rock Art of the Australia Aborigines

TPO 24，Passage 1 Lake Water

TPO 24，Passage 2 Breathing During Sleep

TPO 24，Passage 3 Moving into Pueblos

TPO 25，Passage 1 The Surface of Mars

TPO 25，Passage 2 The Decline of Venetian Shipping

TPO 25，Passage 3 The Evolutionary Origin of Plants

TPO 26，Passage 1 Energy and the Industrial Revolution

TPO 26，Passage 2 Survival of Plants and Animals in Desert Conditions

TPO 26，Passage 3 Sumer and the First Cities of the Ancient Near East

TPO 27，Passage 1 Crafts in the Ancient Near East

TPO 27，Passage 2 The Formation of Volcanic Islands

TPO 27，Passage 3 Predator-Prey Cycles

TPO 28，Passage 1 Groundwater

TPO 28，Passage 2 Early Saharan Pastoralists

TPO 28、Passage 3 Buck Rubs and Buck Scrapes

TPO 29，Passage 1 Characteristics of Roman Pottery

TPO 29，Passage 2 Competition

TPO 29，Passage 3 The History of Waterpower

TPO 30，Passage 1 Role of Play in Development

TPO 30，Passage 2 The Pace of Evolutionary Change

TPO 30，Passage 3 The Invention of the Mechanical Clock

TPO 31，Passage 1 Speciation in Geographically Isolated Populations

TPO 31，Passage 2 Early Childhood Education

TPO 31，Passage 3 Savanna Formation

TPO 32，Passage 1 Platt Colonization

TPO 32，Passage 2 Siam,1851-1910

TPO 32，Passage 3 Distributions of Tropical Bee Colonies

TPO 33，Passage 1 The First Civilizations

TPO 33，Passage 2 Railroads and Commercial Agriculture in Nineteenth-Century United States

TPO 33，Passage 3 Extinction Episodes of the Past

TPO 34，Passage 1 Islamic Art and the Book

TPO 34，Passage 2 Protection of Plants by Insects

TPO 34，Passage 3 The Development of Steam Power