【简答题】Water Pollution The demand for freshwater rises continuously as the world's population grows. From 1940 to 1990, withdrawal of fresh water from rivers, lakes, reservoirs, and other sources has increas...
【简答题】As specialists (experts. predict, in the near future, water will become a restriction (conditioned. factor for social economic development in many parts of China. Water degradation (Intensified wate r...
【简答题】With the fast development of the society, man’s demand for water 1) . But the source from which water can be provided to man has been 2) . The problems caused by water shortage such as 3) have become ...