Passage Three [br] How do traditional vaccines work?To provoke immune systems wi

游客2023-10-21  33

问题 Passage Three [br] How do traditional vaccines work?

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答案 To provoke immune systems with dead or weakened live viruses.

解析 原文最后一段对传统疫苗和新型疫苗进行对比描述,传统疫苗使用死亡的或弱化的病毒来激发免疫系统,故答案为“To provoke immune systems with dead or weakened live viruses.”。
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