裸机JJ第3题找到GWD原题！

jansonwon

贴一个变体，PREP的

100.    (30745-!-item-!-188;#058&005748)    

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

这个选B

fargone

多谢。请问lz贴的标准答案还是自己做的答案？

jansonwon

prep上的标准答案

spyda

贴一个变体，PREP的

100.    (30745-!-item-!-188;#058&005748)    

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

这个选B

-- by 会员 jansonwon (2011/7/17 23:33:50)

这题要是让我做会选D ：TICK在幼虫时期若寄生在白足鼠身上易被感染→其余不带病毒的寄主增加→在幼虫时期不被感染的TICK增加 但是如果成年后，该病毒会通过他们共同的寄主DEER传播，感染数又会提高

verateddy

我也有点疑惑，但是我觉得C可能更好，因为B答案有重复原文的嫌疑
Lyme disease is caused by a bacterium transmitted to humans by deer ticks. 文中已经说了，L病是通过deer ticks来传播的

There are no known cases of a human’s contracting Lyme disease through contact with white-footed mice.

这个不是排除了人直接接触white-footed mice的可能性，不是因该strength了吗

-- by 会员 caijinchen (2011/7/17 21:35:36)