Lesson One 1
Seven Major Rivers in China 1
Reading Material Present Status and Major Problems of River Regulation in China 4
Lesson Two 8
Achievements in Construction of Water Conservancy and Hydropower 8
Reading Material China's Water Power Resources 10
Lesson Three 13
The Three Gorges Project 13
Reading Material The Gezhouba Project 16
Lesson Four 19
The Yellow River 19
Reading Material Taming the Yellow River 22
Lesson Five 25
How Water Circulates Throughout the World 25
Reading Material The Hydrologic Cycle 28
Lesson Six 32
River Floods 32
Reading Material Flood Control 36
Lesson Seven 39
Why Men Build Dams 39
Reading Material History of Dams 43
Lesson Eight 47
Main Types of Dams 47
Reading Material Dam Construction 51
Lesson Nine 55
Levee 55
Reading Material Methods Used in Draining Lands 58
Lesson Ten 62
Water Pollution 62
Reading Material Water Pollution Control and Treatment 66
Lesson Eleven 69
Canals 69
Reading Material The Master Canal-builders 71
Lesson Twelve 75
Saving Water 75
Reading Material Water Treatment 78
Lesson Thirteen 81
Aqueduct 81
Reading Material Aqueducts——Ancient and Modern 83
Lesson Fourteen 86
Irrigation 86
Reading Material Modern Irrigation Systems 89
Lesson Fifteen 92
Soil Conservation 92
Reading Material Soil Erosion 95
Lesson Sixteen 98
Pumps 98
Reading Material Main Types of Pumps 101
Lesson Seventeen 104
Water Power 104
Reading Material Waterpower——a Natural Resource Put to Work 107
Lesson Eighteen 109
Hydraulic Turbine 109
Reading Material How Is a Turbine Working 112
Lesson Nineteen 115
Developing Hydroelectric Power（Ⅰ） 115
Reading Material Developing Hydroelectric Power（Ⅱ） 118
Lesson Twenty 121
Types of Hydroelectric Plants 121
Reading Material Hydroelectric Power 124
APPENDIX Ⅰ 怎样查词典 127
APPENDIX Ⅱ 英语构词法常识 128
APPENDIX Ⅲ 英汉翻译常识 130
APPENDIX Ⅳ VOCABULARY 134
APPENDIX Ⅴ PHRASES AND EXPRESSIONS 157
APPENDIX Ⅵ PROPER NOUNS 163