Unit 1 Explorers 1.Burke and Will——Across Australia 2.Alexandra David-Neel——A French Woman in Tibet 3.Vitus Bering——Across Siberia to North America 4.Robert Scott——A Race to the South Pole 5.Mary Kingsley——Victorian Explorer Unit 2 World Issues 1.World Population Growth 2.Changes in the Family 3.Women and Change 4.Rain Forests 5.The Garbage Project Unit 3 A Misbmash(A Hodgepodge) 1. The Roadrunner 2. Afraid to Fly 3. What Is Jazz? 4.Skyscrapers 5.Left-Handedness Unit 4 Science 1.Biospheres in Space 2.Earthquakes 3.Snow and Hail 4. Photovoltaic Cells——Energy Source of the Future Unit 5 Medicine and Health 1. Headaches 2. Sleep and Dreams 3.Health Care and Epidemics 4.CPR 5.Cholesterol and Heart Disease