※ 引述《littlefarfar (大头)》之铭言： : GWD :12-Q38 : Outbreaks of Rift Valley fever occur irregularly in East Africa, several : years apart. When outbreaks do occur, they kill thousands of cattle. A : livestock vaccine against the disease exists but is rarely used. It is too : expensive for farmers to use routinely, and since it is not effective until a : month after vaccination, administering it after an outbreak begins helps very : little. Nevertheless, experts predict that use of the vaccine will increase : significantly within the next few years. : Which of the following, if true, provides the strongest justification for the : experts’ prediction? 因为文章提到疫苗没有被广泛使用是因为太贵而且施打一个月之後才有效 那为何专家还会预测这疫苗使用会大量增加呢 主要就是要针对文章提到的疫苗无法被使用的原因做探讨 才是最切题的 如果今天疫苗无法被广泛使用的原因消失了 专家的预测就得以证明 可能的情况一是疫苗降价 二是疫苗效率可以提昇 E选项就提供一个让疫苗得以在疫情爆发前就施打的情况 如果疫苗是在疫情爆发後才施打 那就没有用 可是如果固定的气候变化可以在好几个月前就预测疫情的爆发 疫苗就可以提前注射而产生效果 这个就直接反驳了文章中疫苗缺乏效率的原因 也证实了专家的预测 至於B 虽然别国不进口疫区牛肉好像可以支持疫苗会被大量使用 但是疫苗缺乏效率的前提没有被否定 就算别国不进口牛肉 我打了疫苗还是没用 又贵又没用 还不如不要打 所以不会支持专家对於"疫苗会被大量使用"的预测 希望有回答到你的问题:) : A. Rift Valley fever is spread by mosquitoes, but each outbreak is so : widespread that it is impractical to control it by using insecticides. : B. When an outbreak of Rift Valley fever occurs, unaffected countries often : refuse to import livestock from the countries affected by the outbreak. : C. It would take less than a month for producers of the vaccine to adjust : their production operations to cope with a large increase in demand. : D. Many cattle farmers in East Africa are nomadic or live in remote villages, : and such farmers, who have little access to modern veterinary medicine, are : particularly hard hit by outbreaks of Rift Valley fever. : E. Recently published research has shown that certain identifiable climatic : conditions are almost invariably followed, within two to five months, by an : outbreak of Rift Valley fever. : ANS:E : 作了那麽多题目後，只要找到KEY"通常可以答题很快 : 但这题我觉得(B)很像KEY，因为我以为这题是针对"$"来的，很快可以削弱。 : 我也了解E对的原因，但是B到底错的点会是什麽? 无关吗 : 有些貌似无关的却也有可能是正确答案。唉~ : 谢谢耐心看完^^ --

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