第六部分：完形填空(第51~65题，每题1分，共15分)

　　阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案，涂在答题卡相应的位置上。

　　Influenza

　　Influenza has been with us a long time. According to some Greek writers 51 medical history, the outbreak of 412 B.C. was of influenza. The same has been suggested of the sickness 52 swept through the Greek army attacking Syracuse in 395 B.C. Flu is a disease that moves most quickly among people living in 53 conditions, hence, it is likely to attack armies.

　　54 the nineteenth century there were five widespread outbreaks of influenza. The last of the five 55 in 1889 and marked the beginning of the story of influenza in our time. 56 the recent outbreak, it started in Asia.

　　For more than forty years before that outbreak, influenza had steadily __57__and was believed to be dying out. A new group of outbreaks was 58 by the great outbreak of 1889-1890 and for the next quarter of a century influenza remains a constant threat.

　　In April 918 flu broke among American troops stationed in France. It quickly spread through all the ___59 but caused relatively few deaths. Four months later, however, a second outbreak started which _60___ to be a killer. It killed not only the old and already sick but also healthy young adults. It ___61 through every country in the world, only a few distant islands in the South Atlantic and the Pacific remaining __62__. It brought the life of whole countries to stop, food 63 stopped and work loss was very great. Before the great outbreak ended, it had killed ___64 15 million people. Thereafter there have been several great outbreaks throughout the world. It is thus __65__that influenza is a terrible infection that we have to pay more attention to.

　　51. A by B on C to D with

　　52. A where B that C why D who

　　53. A local B good C crowded D rich

　　54. A Since B During C Among D For

　　55. A changed B happened C Among D For

　　56. A Like B As C Along D Before

　　57. A increased B interrupted C decreased D kept

　　58. A introduced B controlled C prevented D reported

　　59. A armies B villagers C farmers D enemies

　　60. A ceased B wanted C proved D failed

　　61. A got B put C went D looked

　　62. A uncounted B unused C untouched D unchanged

　　63. A sources B shortages C purchases D supplies

　　64. A last B most C all D least

　　65. A clear B strange C impossible D wise