Lyme disease is caused by a bacterium transmitted to humans by deer ticks（壁虱）. 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
谢谢
选C吧!
A无关,没有支持people contracting Lyme disease 的数量会下降.
B也起不了支持作用,它只说目前为止没有发现感染案例.
D是泛指,完全无关.
E说的是 other bacteria ,与本文讨论的bacteria 无关.
大家给点意见啊!
逻辑架构：带菌的dt传染disease给人，而该dt在幼年时曾食用某带菌的食物，而其他在幼年时食用这种带菌事物的species却不会带菌。结论：这些其他的species增多的话那感染病菌的人就会减少
C. A deer tick feeds only once while in the larval stage.（support：增强了“该dt在幼年时曾食用某带菌的食物”这个前提）
E. None of the other species on which deer tick larvae feed harbor other bacteria that ticks transmit to humans（选项意思不错，但是只是把“certain other species on which the larvae feed do not harbor the bacterium”这一题干重复了一次而已，起不到削弱的效果）
E. None of the other species on which deer tick larvae feed harbor other bacteria that ticks transmit to humans（选项意思不错，但是只是把“certain other species on which the larvae feed do not harbor the bacterium”这一题干重复了一次而已，起不到削弱的效果）
| 欢迎光临 ChaseDream (https://forum.chasedream.com/) | Powered by Discuz! X3.3 |