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).
The 48 water supply forecast is based more on the water from the 49 than from the below . Interest is 50 in the ways to increase rainfall by man-made methods , and to get water from the winter snow on mountain 51 . With special equipment , some scientists are studying the ways in which the mountain snow can be 52 , and with the help of a repeater station , they send the 53 data (数据) to the base station .
The operator at the base station can get the data at any time by 54 a button . In the near future , the forecast and use of water 55 probably depend on the advance knowledge of snow on mountains , not of water underground .
【題組】47. (A)leading to (B)due to (C)owing to (D)according to
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