一 完形填空（本大题共1小题，共30分）
1.The amount of usable water has always been of great interest in the world . 36 springs and streams sometimes means control , particularly in the 37 areas like the desert . The control is possible even without possession of large areas of 38 land . In the early days of the American West , gun fights were not 39 for the water resources (资源). And laws had to be 40 to protect the water rights of the 41 and the use of the water resources accordingly .
42 is known to us all , there is not 43 water in all places for everyone to use as much as he likes . Deciding on the 44 of water that will be used in any particular period 45 careful planning , so that people can manage and use water more 46 . Farmers have to change their use of or demand for water 47 the water supply forecast (预报).
