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  3. By citing prudent investors’ idea, the author wants to illustrate that From the last two paragraphs, we know that

By citing prudent investors’ idea, the author wants to illustrate that From the last two paragraphs, we know that

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问题 By citing prudent investors’ idea, the author wants to illustrate that
From the last two paragraphs, we know that
选项 A、if each individual counts, one-third of wolves have to be vaccinated.
B、Dr. Haydon proved epidemiologists’ standard assumption is right.
C、to vaccinate 10% to 25% of wolves living in the connected meadows is enough.
D、it takes 20 years to reduce risk of extinction if all the wolves are targeted.
答案C
解析 推理判断题。最后两段主要介绍了流行病学家的设想和Dr. Haydon的研究，他们的观点正好相反，首先排除B，选项A在第五段第一、二句提及，文中说的是三分之二需要注射疫苗而不是三分之一；选项D是对最后一段第一句的断章取义；选项C则是对第五段最后一句的正确理解，故选C。
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