prep08-cr2-100 求解！

qiusian

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

为什么答案是B呢? D错在哪？

3410

Mark一下！               

无所思思

我个人对于B 比较直白的理解 是不是他现在没得吃才去吃白足鼠，也就是说有新的吃的了，它会不会就去吃新的食物。 否则现在够吃，他就是爱吃老鼠，你别的吃的多了他也不会去吃 ，这样逻辑链就不成立了。

bh的海

看一下！               

yjfyjfzzyy

FrankieXiong 发表于 2016-1-21 15:10
我觉得就是

D与 Argument中的因果无关 这个因果是：因为other species的增加会导致幼虫寄生在other specie ...

确实因果无关。但也能对结论产生影响啊？这又怎么解释？

FrankieXiong

我觉得就是

D与 Argument中的因果无关 这个因果是：因为other species的增加会导致幼虫寄生在other species上，所以携带细菌的ticks数量减少

D是说的：成年后没有感染的ticks寄生在deer（这个deer被感染了的ticks寄生）上会不会被感染

sunyuwei

AgendaChen 发表于 2014-6-16 17:24
我有个问题，原文结论是 so the number of ticks acquiring the bacterium would likely decline，因此我理 ...

我跟你的想法一样==

AgendaChen

我有个问题，原文结论是 so the number of ticks acquiring the bacterium would likely decline，因此我理解是larva 改变吃的东西后，感染细菌的ticks（没有特指larva）数量会下降，因此D选项说，尽管ticks在larva时期没被感染，但是在成年后也能被感染，这样就否定了原文说受感染的ticks数量会下降的结论，为什么不行？

醒醒Shine

lacedaemonian 发表于 2013-3-18 23:10
本文的结论是：如果其他deer tick幼虫寄主动物数量能够增加，那么更多的幼虫将会寄食在没有感染的寄主身上 ...

找了半天的解释，就这个终于看懂了！谢谢！！

cutey3

明白了,非常感谢!