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  3. How do vaccines protect humans from diseases according to paragraph 2? The author argues that vaccinations are both a blessing

How do vaccines protect humans from diseases according to paragraph 2? The author argues that vaccinations are both a blessing

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问题 How do vaccines protect humans from diseases according to paragraph 2?
The author argues that vaccinations are both a blessing and a curse because______.
选项 A、saving the many would not necessarily justify the death of the few
B、some vaccines, such as the smallpox vaccine, have negative side effects
C、they don’t always work
D、while many lives are saved, some are actually killed by the vaccine
答案D
解析 细节理解。在文章最后一句，本是一件好事的接种工作背后隐藏着不少非议。它是对上文的总结，即上文是它的原因。不过，该病若卷土重来，就还要实行强制接种，而这必将造成由接种而带来的更多意外死亡。由此可知，选项D正确。选项A、B在原文中没有推理依据；选项C与最后一段的第一句意思不符：值得庆幸的是，在二十世纪七十年代初，天花病毒就已被消灭。
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考研英语一

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