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  3. We can infer from Paragraph 2 that facing the tough task the researchers of WHO ______. Which of the following can be inferred

We can infer from Paragraph 2 that facing the tough task the researchers of WHO ______. Which of the following can be inferred

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问题 We can infer from Paragraph 2 that facing the tough task the researchers of WHO ______.
Which of the following can be inferred from the passage?
选项 A、there is already a case in which the virus is transmitted from person to person.
B、american scientists take the pandemic more seriously than European ones.
C、the effect of candidate vaccines can last more than one year.
D、the manufacture of the vaccine must be authorized by safety authorities.
答案D
解析 为推理判断题。从文章第四段我们可以得知还没有人与人相互传播的情况，因此A项错误。第三段的第二句话说"去年研制的疫苗对于今年的病毒变种来说已经无效了"。所以C项错误。文章倒数第二段谈到疫苗生产者要得到国家或当地政府的批准。因此正确答案为D。
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