问题：
A . bioterrorism is an engineered threat to human beings
B . bioterrorism can be arrested by improving communication
C . natural infections and bioterrorism are the same in essence
D . the anthrax attacks are more threatening than the outbreak of SARS
● 参考解析
【答案】A
【解析】从原文第三段第一句话：“Whether the biggest threat is natural or engineered，much remains to be done”看出，bioterrorism是engineered，所以A对。B选项错在“can be arrested”上。原文是说能够减轻，但不能制止。C说自然的和恐怖主义性质的传染病是同一种性质的，显然不对，因为一个是natural，一个是engineered。D项同样不对。
相关内容
相关标签
