x
1. According to the author, what may be the possible carriers of bird flu?
2. The main sources of influenza viruses in lake water are__________, which may stay infectious for up to 30 days.
3. By saying bird flu viruses appear to exist in ducks in a low-pathogenic form , the author suggests that infection
4. On what condition can the birds spread the influenza through migration?
5. According to the study team, __________is a practice that can encourage transmission of the bird flu.
文章精要
文章重点介绍了禽流感病毒的主要携带者以及其可能的传播途径、变异后果等,还指出迁徙的鸭子可能会将禽流感传染到尚未发现H5N1型禽流感案例的北美大陆。
1.Wild ducks and other migratory birds./Ducks,geese and wading birds.
文章开头指出,野鸭以及其他迁徙鸟类可能是致命性禽流感的重要携带者,由此可得答案;第二段又提到,鸭子可能在传染野鸟,而鹅和涉水鸟也可能是病毒的携带者,由此也可得答案。
2.bird feces
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。
3.doesnt usually lead to severe illness and death
定位到第六段可知,作者提到bird flu viruses appear to exist in ducks in a low-pathogenic form是想表明,传染通常不会导致严重的疾病和死亡。
4.The mutated virus finds its way back into wild populations.
根据题干中的关键词spread和through migration定位到倒数第五段,可知在家禽体内,禽病毒可能变异为像H5N1一样毒性更强的流感病毒,如果此类变异病毒被野鸟感染,这些鸟就会通过迁徙传播流感。
5.grazing in huge flocks
根据题干中的关键词study team和encourage transmission定位到倒数第二段,可知研究组表示,迁徙的鹅可能也是病毒携带者,因为它们经常聚在一起吃草,而这可能会促使病毒的传播。
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