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?
L是由寄生虫传送到人体的细菌引起的。一般来说，寄生虫染上这种细菌在幼虫阶段寄居在感染的老鼠身上。然而，其他种类的宿体不会携带这种细菌。如果其他种类的数量增加了，更多的幼虫将会寄居在未感染的宿主体内。所以染上这种细菌数量的寄生虫将有可能下降。
A.Whether populations of the other species on which deer tick larvae feed are found only in areas also inhabited by white-footed mice
寄生虫寄居的其他种类的的宿体仅仅在老鼠存在的地方的地方才能找到与数量无关
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
鹿群的数量是不是被食物的数量所限制了yes: weaken 没有宿主的寄生虫先有宿体no: assumption 只有这个前提成立才不会被weaken
C．Whether the infected deer tick population could be controlled by increasing the number of animals that prey on white-footed mice
感染的寄生虫能否被增加的其他以老鼠为宿主的物种控制 无关
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
没有在幼虫阶段被感染的寄生虫是否会在成年阶段被感染通过寄居在已经感染的寄生虫寄居的宿体上
E. Whether the other species on which deer tick larvae feed harbor any other bacteria that ticks transmit to humans
Other than 超出范围
求问D啊 看过一个讨论帖 但是不明白对里面的yes or no的回应~
我想说我读逻辑题好有障碍啊！这道题我是一句一句的翻译才弄懂了 现在读逻辑总有读阅读的惯性 肿么办呢~
求指教！！
-- by 会员 梦宝要米国 (2011/9/15 8:54:50)
梦宝要米国 : 我觉得你弄混deer和deer tick了，后者是寄生在鹿上的虱子 ：－）这道题题干的意思是：
premise:一种虱子在幼虫阶段可能会感染一种细菌，这种病菌是当幼虫寄生在白爪耗子时被感染的。但是，如果幼虫虱子寄生在其他寄主身上则不会感染这种细菌。
conclusion: SO~要是除了白爪耗子之外的寄主数量增加，那么更多的幼虫就会寄生在非白爪耗子寄主身上，那么感染病菌的鹿虱数量就降低了。
D选项的意思是：那些幼虫阶段没染病君的健康鹿虱会不会在成年的时候感染细菌，如果这些健康的鹿虱寄生在已经被染病鹿虱寄生的鹿身上。这个选项和premise相悖，premise说generally tick pick up the bacteria in larval stage. 所以可以判断排除
B选项：
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鹿虱的总数量是否受限于 鹿虱在幼虫阶段时寄主的数量。这个选项恰巧回答了这个推论的assumption: 如果是，鹿虱数量受限于幼虫阶段寄主的数量，那么随着非白爪耗子其他寄主数量的增加，整体的幼虫数量也增加，那么本来寄生在白爪耗子身上的幼虫，就没有必要
迁徙 到其他寄主身上了！那么，寄生在白抓耗子身上的幼虫数量不会减少，染病的虱子数量也不会减少，so命题推翻。-- by 会员 chachamao (2011/9/29 10:46:44)
我觉得这个解释不对。