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
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正确答案：
A
本题解析：
【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*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。