The recent identification of strains of plague resistant to drugs, and the possibility of using the microbe "yersinia pestis" as

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问题 The recent identification of strains of plague resistant to drugs, and the possibility of using the microbe "yersinia pestis" as a chemical weapon in a war, mean that plague still______humans.

选项 A、opens up an opportunity to
B、poses a threat to
C、offers assistance to
D、remains a rival to

答案B

解析 句意:最近具有抗药性瘟疫的发现,以及把细菌“鼠疫耶尔辛杆菌”作为战争中化学武器的可能性,这都意味着瘟疫仍旧威胁着人类的生存。pose a threat to成为……的威胁。
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