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  3. We can infer from Paragraph 2 that facing the tough task the researchers of WHO ______. During the developing of the vaccine, t

We can infer from Paragraph 2 that facing the tough task the researchers of WHO ______. During the developing of the vaccine, t

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问题 We can infer from Paragraph 2 that facing the tough task the researchers of WHO ______.
During the developing of the vaccine, the biggest problem may probably be ______.
选项 A、the combination of bird flu virus with human flu virus.
B、the virus mutates in a short period.
C、the vaccines are ineffective against the virus.
D、the time is pressing for the scientists.
答案B
解析 为推理判断题。文章第三段第一句话讲到："最大的困难可能就在于病毒的迅速变异了。去年生产的H5N1病毒备用育苗对今年的病毒完全没有作用"。所以此题的答案应该是B：病毒变异周期短。而 C：疫苗对病毒不起作用，只是现象，而非本质，应排除。答题时要切中问题要点。
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