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  3. During the H1N1 flu pandemic, schools closed, health officials encouraged hand washing and warned pregnant women to get vaccinat

During the H1N1 flu pandemic, schools closed, health officials encouraged hand washing and warned pregnant women to get vaccinat

admin2012-10-21  50
问题     During the H1N1 flu pandemic, 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【B5】______by Dr. Edward Belongia compares the【B6】______of the pandemic flu to the seasonal flu. "We really saw very few differences when we compared the symptoms of illness and the risk of 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【B8】______it. The study was limited to patients in Marshfield, Wisconsin. The doctors found that【B9】______. Unlike the seasonal flu,【B10】______. Dr. Belongia says it’s logical. "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【B11】______." added Dr. Belongia.
【B5】
选项
答案led
解析 分析句子结构可知，句子不缺主干成分，空所在位置及空后的介词by提示，本空应填一过去分词，与by Dr. Edward Belongia一起作后置定语。
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