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  3. During the H1N1 flu pandemic(流行病), schools closed, health officials encouraged hand washing and warned pregnant women to get vac

During the H1N1 flu pandemic(流行病), schools closed, health officials encouraged hand washing and warned pregnant women to get vac

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问题     During the H1N1 flu pandemic(流行病), schools closed, health officials encouraged hand washing and warned pregnant women to get vaccinated once a vaccine was【B1】______.
    The World Health Organization says the virus killed more than 16,000 people【B2】______. Last November, Dr. Debra Parsons【B3】______up to 20 kids a day for the H1N1 flu. She says the symptoms are like that of any flu. "H1N1 symptoms generally include【B4】______body aches, chills, fever, wheezing, shortness of breath," said Dr. Parsons. A new U.S. study led by Dr. Edward Belongia compares the【B5】______of the pandemic flu to the seasonal flu. "We really saw very few differences when we compared the symptoms of illness and【B6】______complications in people that had the pandemic H1N1【B7】______versus those who had seasonal strains of influenza A," noted Dr. Belongia. Doctors at the Marshfield Clinic in Wisconsin had studied seasonal flu in the town for several years. When the H1N1 pandemic hit, the Centers for Disease Control asked them to begin monitoring it. The study【B8】______patients in Marshfield, Wisconsin. The doctors found that H1N1 did not cause more hospitalizations or serious complications than seasonal flu. Unlike the seasonal flu, those most【B9】______H1N1, a new virus, were children and young adults. Dr. Belongia says it’s【B10】______. "It’s a combination of a new virus and populations that have very little pre-existing immunity to the virus, particularly children and young adults, so their immune systems have not seen this virus and have not seen a similar virus in the past," added Dr. Belongia.
【B10】
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答案logical
解析 空前的it’s表明，本空应填一名词或形容词作表语。logical意为“合乎逻辑的”。
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