题目内容：
根据下面材料，回答题。 Influenza
Influenza has been with us a long time. According ____1____ some Greek writers on medical history, the outbreak of 412 B. C. was of influenza. The same has been suggested of the sickness that swept through the Greek army____2____ Syracuse in 395 B. C. Flu is a disease that moves most quickly among people ____3____ in crowded conditions, hence, it is likely to attack armies.
During the nineteenth century there were five widespread____4____of influenza. The last of the five ____5____ in 1889 and marked the beginning of the story of influenza in our time. Like the recent outbreak,____6____started in Asia.
For more than forty years before that outbreak, influenza had steadily____7____and was believed to be dying out. A new group of outbreaks was introduced by the great outbreak of 1889-1890 and for the next quarter of a century flu____8____a constant threat.
In April 1918 flu broke out among American troops stationed in France. It quickly spread through all the armies but caused relatively____9____deaths. Four months later,____10____, a second outbreak started which proved to be a killer. It killed not only the old and already sick but also ____11____ young adults. It went through every country in the world, only a few distant islands in the South Atlantic and the Pacific remaining ____12____. It brought the life of whole countries ____13____, food supplies stopped and work loss was very great. Before the great outbreak ended, it ____14____at least ____15____ million people.
Thereafter there have been several great outbreaks throughout the world. It is thus 15 that influenza is a terrible infection that we have to pay more attention to.
__________ A．at
B．to
C．in
D．from
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