标题: 请教Lyme Disease的问题 [打印本页] 作者: youchangyi 时间: 2009-12-10 16:56 标题: 请教Lyme Disease的问题 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 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 直接是B,C即可，为何B不对呢？作者: youchangyi 时间: 2009-12-13 12:52
anybody???作者: 10号路人 时间: 2010-9-8 23:29
up！同问。作者: bijinjing 时间: 2010-9-9 09:53
B是无关选项，题目说人是通过deer ticks传染的，有没有直接接触white-footed mice没有关系。加强是加强推理过程或结果。推理过程是deer ticks感染率少 推 人感染率少，加强其中任何一条。答案是对第一条的加强，只捕食一次，其他larvae变多的话，减少了deer ticks 对white··的接触机会少，感染就少了作者: inuitniu 时间: 2013-1-1 18:50
感觉这道题不严密啊作者: 微言葳行 时间: 2019-7-4 12:11
C 感觉也不影响啊，只吃一次tick感染的概率低，吃多次感染的概率高，但无论整体高还是低，都不影响increase other species会使ticks infected decline这个变化啊，我们要看不是status而是这个变化啊