Unit 1 Water Cycle Text A： Hydrologic Cycle Text B： Water's Journey Through Time Unit 2 Water Resources Text A： Facts on Water Resources Text B： Types of Water Resources Unit 3 Lakes and Rivers Text A： Freshwater Lakes and Rivers Text B： Rivers， Streams， and Creeks Unit 4 Reservoirs Text A： Types of Reservoirs Text B： Three Gorges Reservoir Region Unit 5 Flood Control Text A： Flood Control and Disaster Management Text B： More Floods， More Effective Flood-fighting Technology Unit 6 Irrigation and Drainage Text A： Modern Irrigation System Planning and Construction Text B： Modern Drainage System Construction Unit 7 Dams Text A： Dams Are a Vital Part of the National Infrastructure Text B： Dams： What They Are and What They Do Unit 8 Hydraulic Turbines Text A： Hydro Turbine Text B： Factors Affecting the Selection of Hydraulic Turbines Unit 9 Hydroelectric Power Text A： Hydropower Today Text B： Hydroelectric Energy and Its Pros and Cons Unit 10 Water Pollution Text A： Water Pollution-Everything You Need to Know Text B： What Are the Effects of Water Pollution? Appendix： Glossary
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