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  3. According to the author,what may be the possible carriers of bird flu? The main sources of influenza viruses in lake water are

According to the author,what may be the possible carriers of bird flu? The main sources of influenza viruses in lake water are

admin2009-08-19  2
问题 According to the author,what may be the possible carriers of bird flu?
The main sources of influenza viruses in lake water are ______, which may stay infectious for up to 30 days.
选项
答案bird feces
解析 根据题干中的关键词lake water和30 days定位到第四段，可知研究表明，湖水中的流感病毒一般是通过鸟粪传播的，这些病毒的传染性可长达30天。
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