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.

36. A. Using     B. Holding    C. Owning              D. Finding

37. A. dry     B. distant      C. deserted              D. wild

38. A. fine     B. beautiful    C. rich    D. farming

39. A. unlawful   B. unacceptable  C. unpopular   D. uncommon

40. A. made     B. designed    C. signed   D. written

41. A. winners    B. settlers     C. fighters   D. supporters

42. A. That     B. It        C. What      D. As

43. A. plentiful   B. enough   C. any       D. much

44. A. type     B. quality   C. amount     D. level

45. A. requests    B. requires   C. means       D. suggests

46. A. effectively  B. easily    C. conveniently   D. actively

47. A. leading to   B. due to   C. owing to    D. according to

48. A. correct    B. further   C. average    D. early

49. A. clouds    B. sky     C. air         D. above

50. A. raising    B. rising    C. building    D. lasting

51. A. rocks     B. tips     C. tops        D. trees

52. A. taken care of   B. made use of   C. piled up      D. saved up

53. A. picked   B. produced     C. used           D. gathered

54. A. touching   B. knocking   C. pressing           D. turning

55. A. might    B. can       C. will                   D. should

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