Re: [CR. ] GWD-12-Q38

看板GMAT (GMAT入學考試)作者danyuchn (Javy)時間14年前 (2012/04/29 20:39)推噓0(0推 0噓 0→)

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※ 引述《Zentigra (Amygdala)》之銘言： : 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? : 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. : 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 : Answer 是E, 請問如何排除A跟B呢 : A--> 無法透過控制病原的方式減輕疫情, 所以需要疫苗 (似乎合理?) 不代表需要疫苗，可能有其他方法(如培養細菌天敵-生物療法) : B--> farmer的生意被impact, 所以increase demand for vaccine (似乎也合理?) 一樣，其他方法只要比疫苗好，你的推論一樣不成立 Dustin : Thanks -- No swing, no Jazz. http://blog.pixnet.net/danyuchn73 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 220.135.39.62