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

游客2023-09-15  28

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 infections 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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