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  3. While the world’s flu fighters have concentrated on countering the H1N1 swine flu, bird flu H5N1 has quietly continued to take i

While the world’s flu fighters have concentrated on countering the H1N1 swine flu, bird flu H5N1 has quietly continued to take i

admin2010-12-04  69
问题    While the world’s flu fighters have concentrated on countering the H1N1 swine flu, bird flu H5N1 has quietly continued to take its 【C1】______  on both poultry and humans. Last year, 17 countries, 【C2】______  from Germany to Japan, reported outbreaks of H5N1 in 【C3】______  poultry and wild birds; and the World Health Organization, which still says H5N1 causes a worldwide threat, recoded 72 human 【C4】______ , 32 of them fatal.
   The major outbreak, entering its 【C5】______  year, is still in the developing countries of Asia.  Indonesia 【C6】______  accounted for 19 of the 32 H5N1 deaths; Vietnam, 【C7】______  5. But there are signs of 【C8】______ .
   The number of human deaths has been 【C9】______  since peaking at 79 in 2006. And fewer countries reported outbreaks in 2009 than in 2008.
   Partnership researchers compared notes on the effectiveness of control measures. Scientists reported that carefully 【C10】______  killing can be just as effective as wide spread killing, and less 【C11】______  . Others reported that reducing risk among those 【C12】______  backyard poultry has to be a community-wide effort, since changing the practices of 【C13】______  farmers has proven difficult.
   In particular, Science Insider reported that a 3- year-old  regional  investigation  network  is making 【C14】______  in sorting out the role of wild birds. Some water birds 【C15】______  thought to be spreading the virus, such as the Asian open bill stork, are now known to quickly die of H5N1 infection, Wiriyarat says. But pas serine species , or perching birds, are apparently 【C16】______  the virus without ill effects, says an Asian zoologist. He also adds that there is a high 【C17】______  of outbreaks in poultry and passerine movements.
   Wiriyarat says it is still 【C18】______  what is causing the outbreak, whether there is a natural storage for H5N1, and how the virus is 【C19】______  between domestic and wild birds. But while that research continues, the most effective way to reduce the amount of virus in 【C20】______  is to control outbreaks in poultry, he says.  
【C15】
选项 A、initially
B、actually
C、finally
D、wrongly
答案A
解析 副词辨析题。分析句意，后文中now表明现在人们知道的事实是水禽死于H5N1病毒，由此可见前面提到“认为水禽传播疾病很快”是人们以前的观点，因此选A)“原本以为”，表示事实并非如此。 B)“事实上”；C)“最终”：D)“错误地”，都不合适，应该排除。
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