3.(典型例题

    The amount of usable water has always been of great interest in the world.  1  springs and streams sometimes means control, particularly in the  2  areas like the desert. The control is possible even without possession of large areas of  3  land. In the early days of the American West, sun fights were not  4  for the water resources (资源), and laws had to be  5  to protect the water rights of the  6  and the use of the water resources accordingly.

      7  is known to us all, there is not  8   water in all places for everyone to use as much as he likes, Deciding on the  9  of water that will he used in any particular period  10  careful planning, so that people can manage and use water more  11  . Farmers have to change their use of or demand for water  12  the water supply forecast(预报).

The  13  water supply forecast is based more on the water from the  14  than from the below. Interest is   15  in the ways to increase rainfall by man--made methods,and to getwater from the winter snow on mountain   16  . With special equipment,some scientists are studying the ways in which the mountain snow can be  17  , and with the help of a repeater station,they send the  18  data(数据) to the base station. The operator at the base station can get the data at any time by   19  a button. In the near future, the forecast and use of water  20  probably depend on the advance knowledge of snow on mountains, not ol water underground.

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