标题: ???T-9-Q28. 天山-7-13 B [打印本页] 作者: 王梦醒 时间: 2011-8-28 02:23 标题: ???T-9-Q28. 天山-7-13 B Lyme disease is caused by a bacterium transmitted to humans by deer ticks一种虱子. 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 adverse consequences from carrying the bacterium that causes Lyme disease in humans. B. There are no known cases of a human’s contracting Lyme disease through contact with white-footed mice. C. A deer tick feeds only once while in the larval stage. D. A single host animal can be the source of bacterium for many tick larvae. E. None of the other species on which deer tick larvae feed harbor other bacteria that ticks transmit to humans 答案选C 好乱,看不懂啊看不懂。能不能翻译一下?画个逻辑简图什么的。。是不是就是说虱子传染疾病能够给人,虱子在幼虫期吃白脚耗子传染上细菌,但是其他的食物都没有这种细菌。因此,如果其他食物要是增多,携带细菌的虱子数量就会减少,人的病也就会少了。然后加强。可答案为什么选“虱子在幼虫期只吃一次食物”,这是怎么加强的啊???为什么不选B啊?如果人不能通过接触白脚耗子直接得病,那么不更是加强吗?相当于排除了他因啊。。。死活不懂啊。。小女谢谢了作者: hanshipeng 时间: 2011-8-28 04:35
C说的是这,当tick在幼虫时是染病毒的时期,但是如果仅仅就feed一次,那么当其他种类增加,那么这一次机会命中到白脚耗子的机会就减少了。从而tick携带病毒的机会就少了。就类似于一次性的抽样调查。作者: 王梦醒 时间: 2011-8-28 11:52
(⊙o⊙)嗯,C我懂了,但是B 我还是不明白呀。。。作者: louishirley 时间: 2012-3-22 15:47
贴一个lawyer的解答~