2015年1月19日GMAT考试刚刚完成了新一轮题库更换。这次短库让很多考生感到措手不及。新东方网GMAT频道在此为各位考生整理了2015年2月GMAT逻辑机经之莱姆病与鹿蜱，供考生们参考使用，希望对各位备考能有帮助。

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　　莱姆病与鹿蜱

　　V1

　　Lyme disease is caused by a bacterium transmitted to humans by deer ticks. Generally deer ticks pick up the bacterium while in the larval stage from feeding on infected white-footed mice. However, certain other species on which the larvae feed do not harbor the bacterium. Therefore, if the population of these other species were increased, the number of ticks acquiring the bacterium and hence the number of people contracting Lyme disease would likely decline.

　　Which of the following, if true, most strengthens the argument?

　　(A) Ticks do not suffer any adverseconsequences from carrying the bacterium that causes Lyme disease in humans.

　　(B) There are no known cases of a human’scontracting Lyme disease through contact with white-footed mice.

　　(C) A deer tick feeds only once while inthe larval stage.

　　(D) A single host animal can be the sourceof bacterium for many tick larvae.

　　(E) None of the other species on which deertick larvae feed harbor other bacteria that ticks transmit to humans

　　考古

　　OG-12

　　Lyme disease is caused by a bacterium transmitted to humans by deer ticks. Generally, deer ticks pick up the bacterium while in the larval stage by feeding on infected white-footed mice. However, certain other species on which the larvae feed do not harbor the bacterium. If the population of these other species were increased, more of the larvae would be feeding on uninfected hosts, so the number of ticks acquiring the bacterium would likely decline.

　　Which of the following would it be most important to ascertain in evaluating the argument?

　　A. Whether populations of the other species on which deer tick larvae feed are found only in areas also inhabited by white-footed mice

　　B. Whether the size of the deer tick population is currently limited by the availability of animals for the tick's larval stage to feed on

　　C. Whether the infected deer tick population could be controlled by increasing the number of animals that prey on white-footed mice

　　D. Whether deer ticks that were not infected as larvae can become infected as adults by feeding on deer on which infected deer ticks have fed

　　E. Whether the other species on which deer tick larvae feed harbor any other bacteria that ticks transmit to humans

　　背景知识

　　莱姆病是一种以蜱为媒介的螺旋体感染性疾病。我国于1985年首次在黑龙江省林区发现本病病例，以神经系统损害为该病最主要的临床表现。其神经系统损害以脑膜炎、脑炎、颅神经炎、运动和感觉神经炎最为常见。其中一期莱姆病仅用抗生素即可奏效，至二期、三期用抗生素无济于事，特别是神经系统损害更乏特效疗法。早期以皮肤慢性游走性红斑为特点，以后出现神经、心脏或关节病变，通常在夏季和早秋发病，可发生于任何年龄，男性略多于女性。发病以青壮年居多，与职业相关密切。以野外工作者、林业工人感染率较高。据报道疫区室外工作人员劳动一天后有40%被蜱叮咬史，或可从其皮肤、衣服等处找到蜱。室外消遣活动如狩猎、垂钓和旅游等均可增加感染莱姆病的危险性。

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