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The Flu Virus Can not Be Foreseen There is a joke among flu researchers: " If you’ve seen one flu season, you’ve seen. . . o

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问题                     The Flu Virus Can not Be Foreseen
    There is a joke among flu researchers: " If you’ve seen one flu season, you’ve seen. . . one flu season." For those not up on epidemiological humor: the joke is wry commentary on the unpredictable nature of the flu virus. Every year it looks different,and every strain follows its own types. This is not just a coincidence that frustrates scientists-it’s the reason new strains like H1N1 are impossible to anticipate and fully prepare for.
    " I know less about influenza today than I did 10 years ago," quips Dr. Michael Oster-holm, director of the Minnesota Center of Excellence for Influenza Research and Surveillance and a former adviser to the U. S. Department of Health and Human Services. "Every stone we’ve turned over,we get more questions than we do answers."
    The flu returns every season and the world periodically experiences catastrophic pandemics, but epidemiologists still do not understand why some strains evolve to infect people and others do not;they are not entirely sure about how the flu is transmitted; nor do they understand why some patients become fatally ill while others develop minimal symptoms. As a result, when a new strain shows up—like H1N1—they often have little information to fall back on,and the lessons of previous pandemics are only somewhat helpful. While epidemiologists are still putting together a complete picture of H1N1, for example, its most striking difference with the seasonal flu is that the elderly are not the most vulnerable population. And when H1N1 does cause serious illness, patients develop different complications that are more difficult to treat than those with seasonal flu. "It’s a very different death," says Osterholm.
    The Centers for Disease Control currently maintains six different categories of flu-surveillance programs,but has rolled out new measures this year in order to monitor H1N1 ’s most worrying features. The backbone of its routine surveillance systems is not designed to count individual flu cases, but rather to get general indicators of how widespread the flu is and which strains are in circulation. " Influenza’s chimerical nature makes it a moving target for researchers," says Dr. Allison Aiello, assistant professor of epidemiology at the University of Michigan. " Even if we had complete seasonal flu data from the past, it wouldn’t necessary be helpful for a new strain of influenza," she explains.
What does the author try to tell us by introducing a joke among flu researchers?
选项 A、Everyone will experience different flu seasons every year in different areas.
B、Due to the unpredictable nature, every year there are different types of flu virus.
C、There are different patterns of flu virus in different seasons every year.
D、Researchers recommend different methods to deal with flu in different seasons.
答案B
解析 推理判断题。根据题干提示定位到文章第1段第1句：There is a joke among fluresearchers：“If you’ve seen one flu season，you’ve seen．．．one flu season．”该段第2、3句实际是对引文的补充说明，作者提到Every year it looks different．．．follows its ownpattern．．．it’s the reason new strains like H1N1 are impossible to anticipate and fully preparefor.说明每年流感病毒都不同，所以没有办法预测和预防。
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