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  3. According to the author,what may be the possible carriers of bird flu? [br] The

According to the author,what may be the possible carriers of bird flu? [br] The

游客2023-09-15  50
问题 According to the author,what may be the possible carriers of bird flu? [br] 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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