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
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