Question 1: How to understand that "water is the source of life, the key to production and the ecological foundation" is the source of life, the key to production and the ecological foundation. Building water conservancy projects and eliminating floods are related to human survival and social progress, and have always been a major event in governing the country and safeguarding the country. Recently, Comrade made an important speech on ensuring national water security. Standing on the strategic height of the overall development of the cause of the party and the country, the speech incisively discussed the extreme importance of water control to the development of the nation and the prosperity of the country, profoundly analyzed the grim situation of water security in China at present, systematically expounded the overall requirements for ensuring national water security, clearly put forward new ideas for water control in the new period, and pointed out the direction for us to strengthen water control and ensure water security.

Question 2: "Water is the source of life, the key to production and the foundation of ecology" is one of the propaganda slogans of 20 14 "China Water Week". The following understanding of water is correct: (a) Water is composed of hydrogen and oxygen, so A is wrong; B, in the method of purifying water, the water obtained by distillation is almost the highest purity water, but distilled water does not contain trace elements and minerals needed by human body, so drinking distilled water for a long time is not good for the body, so B is wrong; C, China's per capita available fresh water resources are very few, so we should save water. Therefore, C is correct; D, activated carbon has adsorption, adsorption odor and pigment, adsorption with activated carbon can not reduce the hardness of water, so D is wrong; So choose: C.

Question 3: (60 points) Water is the source of life, the key to production and the foundation of ecology. Developing water conservancy and eliminating water disasters are related to ecological security, national security, human survival and early economic development (1); Water conservancy project construction; The promotion of political center. (6 points) (2) Natural factors: serious soil erosion; Climate change and hydrogeological change (4 points). Man-made reasons: the destruction of long-term war; * * * The construction of water conservancy projects is not strong enough (e.g. the scale of water conservancy projects is gradually decreasing). (6 points). Impact: the decline of Guanzhong area (2 points); South shift of economic center of gravity and east shift of political center of gravity (2 points)

Question 4: Water is the source of life, the key to production and the foundation of life. Quancheng citizens should cherish, save and protect water. Please complete the following questions: (1) Pay attention to the adsorption of drinking (1); (2)B； (3)①t 1； ②