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第6部分：完形填空（第51-65题，每题1分，共15分）
下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。
Influenza(流感)
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. Influenza 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 onC toD with
52、AwhereB thatC whyD who
53、AlocalB goodC crowdedD rich
54、ASinceB DuringC AmongD For
55、AchangedB happenedC stoppedD suffered
56、ALikeB AsC Along D Before
57、AincreasedB interruptedC decreasedD kept
58、AintroducedB controlledC preventedD reported
59、AarmiesB villagers C farmersD enemies
60、AceasedB wantedC provedD failed
61、A gotB putC wentD looked
62、AuncountedB unusedC untouchedD unchanged
63、AsourcesB shortagesC purchasesD supplies
64、AlastB mostC allD least
65、AclearB strangeC impossibleD wise