About 400 earthquakes   46   worldwide every day, more than a hundred thousand in a year.

    China is   47   one of the most active earthquake regions in the world. The most serious of these occurred in Hua County in 1556. The earthquake   48   eight provinces in central China. It   49   an area of 800 square kilometers. In all, 830,000 people   50  .

    The California earthquake of the 18th of April is the worst earthquake that   51   in the United States.

    Fires caused by the California Earthquake   52   the most damage. The fires burned for three days,   53   a total of 25,000 buildings.

    In the whole of California, the earthquake and fire   54   about 3000   55  .

46. A. occurred             B. is occurred               C. occur                       D. was occurred

47. A. situated in           B. situate in                  C. situation of               D. situated by

48. A. affects                B. affected                    C. effects                      D. effected

49. A. was covered        B. is covered                 C. covers                      D. covered

50. A. lose their lives     B. loss their life            C. lost their life             D. lost their lives

51. A. has ever happened                                  B. have ever happened  

C. has ever been happened                                 D. have ever been happened

52. A. made                  B. took                         C. did                          D. do

53. A. destroying           B. destroyed                 C. to destroy                 D. to be destroying

54. A. was caused          B. caused                      C. is caused                  D. causes

55. A. death                  B. dying                       C. deaths                      D. dead