※ 引述《littlefarfar (大頭)》之銘言： : 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? 因為文章提到疫苗沒有被廣泛使用是因為太貴而且施打一個月之後才有效 那為何專家還會預測這疫苗使用會大量增加呢 主要就是要針對文章提到的疫苗無法被使用的原因做探討 才是最切題的 如果今天疫苗無法被廣泛使用的原因消失了 專家的預測就得以證明 可能的情況一是疫苗降價 二是疫苗效率可以提昇 E選項就提供一個讓疫苗得以在疫情爆發前就施打的情況 如果疫苗是在疫情爆發後才施打 那就沒有用 可是如果固定的氣候變化可以在好幾個月前就預測疫情的爆發 疫苗就可以提前注射而產生效果 這個就直接反駁了文章中疫苗缺乏效率的原因 也證實了專家的預測 至於B 雖然別國不進口疫區牛肉好像可以支持疫苗會被大量使用 但是疫苗缺乏效率的前提沒有被否定 就算別國不進口牛肉 我打了疫苗還是沒用 又貴又沒用 還不如不要打 所以不會支持專家對於"疫苗會被大量使用"的預測 希望有回答到你的問題:) : 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 : 作了那麼多題目後，只要找到KEY"通常可以答題很快 : 但這題我覺得(B)很像KEY，因為我以為這題是針對"$"來的，很快可以削弱。 : 我也了解E對的原因，但是B到底錯的點會是什麼? 無關嗎 : 有些貌似無關的卻也有可能是正確答案。唉~ : 謝謝耐心看完^^ --

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