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  3. We can infer from Paragraph 2 that facing the tough task the researchers of WHO ______. The vaccine generated by reverse geneti

We can infer from Paragraph 2 that facing the tough task the researchers of WHO ______. The vaccine generated by reverse geneti

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问题 We can infer from Paragraph 2 that facing the tough task the researchers of WHO ______.
The vaccine generated by reverse genetics is required to review in that ______.
选项 A、it has strong side effect to the elderly.
B、it may turn ineffective in a short period.
C、it is useless in preventing the virus.
D、it hasn’t been tested in humans.
答案D
解析 为推理判断题。文章第六段第一句话说："由反遗传学开发而来的疫苗从来没有做过临床试验，因此，备用疫苗首先要进行明确严格的检查"。因此，此题目的最佳答案是D。
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