PASSAGE TWO What does the word "lineage" in the last paragraph mean?

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问题 PASSAGE TWO
What does the word "lineage" in the last paragraph mean?

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答案Strain.

解析 根据lineage前面的other可知该句应与前一句并列,上文提到HIV的M群是导致艾滋病传染的主要菌株(main strain of the virus),再结合修饰lineages的定语从句that could pose risks…,可知lineage在此处是strain之义,故答案为Strain。
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