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  3. Next time you feel the flu coming on, think twice before reaching for painkillers—they could do more【C1】______ than good. With t

Next time you feel the flu coming on, think twice before reaching for painkillers—they could do more【C1】______ than good. With t

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问题     Next time you feel the flu coming on, think twice before reaching for painkillers—they could do more【C1】______ than good. With the flu season【C2】______ way across Europe and North America, millions will be taking flu【C3】______, which commonly include painkillers. The general【C4】______ advice in the UK and the US is to take painkillers. But although painkillers can make you feel better they also lower fever, which can make the virus【C5】______.
    The first analysis of the effect of this on the【C6】______ shows that painkillers taken at current levels to【C7】______ fevers could cause 2,000 flu deaths each year in the US alone. Fever is thought to be a【C8】______ against viruses, because many viruses find it hard to【C9】______ above our normal 37 °C. Some studies have shown that lowering fever may【C10】______ virus-related infections and increase the amount of virus we can【C11】______ on to others.
    To find out what【C12】______ this might have on a flu epidemic, David Earn and his colleagues【C13】______ to a 1982 study which showed that ferrets, a【C14】______ animal model for human flu produced more【C15】______ flu virus if their fevers were lowered with painkillers. Earn’s team used these findings to estimate how much more virus people with【C16】______ flu might produce if their fevers were【C17】______.
    With the help of a mathematical model, Earn’s team【C18】______ their estimates to the number of people a year in the US who get flu,【C19】______ fever and take the drugs. They found that painkillers as used in the US could be increasing the【C20】______  of ordinary winter flu by up to 5 per cent.
【C14】
选项 A、regular
B、average
C、mutual
D、common
答案D
解析 此处提到一项用雪貂做实验的医学研究(研究人类流感传播的问题)，用某种特定的动物做实验来研究人类的相关问题是医学研究的常规做法，故选D项common“通常的，常见的”。
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