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  3. Pandemic(大面积流行的) H1N1 2009 The most active areas of pandemic influenza transmission currently are in central and eastern Eur

Pandemic(大面积流行的) H1N1 2009 The most active areas of pandemic influenza transmission currently are in central and eastern Eur

admin2011-04-15  44
问题                Pandemic(大面积流行的) H1N1 2009
    The most active areas of pandemic influenza transmission currently are in central and eastern Europe. Focal(集中的) increases in rates during recent weeks were______【51】in at least two eastern European countries. A high intensity of respiratory (呼吸的) disease activity with concurrent (同时存在的) circulation of pandemic influenza still ______【52】in parts of southern and eastern Europe, ______【53】in Greece, Poland, and Ukraine.
    In Western Europe, influenza transmission remains ______【54】and widespread, but overall disease activity has peaked. All influenza viruses in Western Europe were pandemic H1N1 2009, ______【55】, very small numbers or seasonal influenza viru-ses covering less than 1% of all influenza viruses found, were reported in Russia. In ______【56】, limited available data indicate that active, high intensity transmission is occurring in Northern African countries______【57】the Mediterranean coast.
    In Central Asia, limited data______【58】that influenza virus circulation remains active, but transmission may have recently peaked in some places. In West Asia, Israel, Iran, and Iraq also appear to have passed their______【59】period of transmission within the past month though both areas continue to have some active transmission and levels of respiratory disease activity have not yet______【60】to baseline levels. In East Asia, influenza transmission remains active but appears to be______【61】overall. Slight increases in ILI were reported in Mongolia after weeks of declining activity following a large peak of activity______【62】one month ago.
    In North America, influenza transmission______【63】widespread but has declined quickly in all countries. In the tropical regions of Central and South America and the Caribbean, influenza transmission remains geographically widespread but overall disease ______【64】has been declining or remains unchanged in most parts.
    ______【65】for focal increases in respiratory disease activity in a few countries.
选项 A、yet
B、still
C、however
D、until
答案C
解析 本题难度不大, 考查however的用法, 前一句出现了转折词but, 此处有连续出现了两个逗号, 比较明显, 此处要用however, 答案是C。
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