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本贴相关题目 TN-13-CR-28 (ARSW)

00:00:00

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?

ATicks do not suffer any adverse consequences from carrying the bacterium that causes Lyme disease in humans.
BThere are no known cases of a human's contracting Lyme disease through contact with white-footed mice.
CA deer tick feeds only once while in the larval stage.
DA single host animal can be the source of bacteria for many tick larvae.
ENone of the other species on which deer tick larvae feed harbor other bacteria that ticks transmit to humans.

正确答案: C

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GWD（TN）13-Q28

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楼主

发表于 2009-8-12 00:27:00 | 显示全部楼层

我的想法:

命题是:增加其他物种从而降低老鼠的比例,可以降低人得病的几率.

下面看选项

A 讲虱子不得病,成立与否与命题无关

B 讲没有人与老鼠接触的病的case, 如果成立,会削弱命题中关于老鼠和的病的关系

C 如果虱子只寄生(我不知道这个feed on在这里到底是吃还是寄生,anyway...)一次的话,加上命题中提到的增加其他物种,那么虱子的带菌率就会降低从而降低人的感染率.加强命题.

D 一只寄主可以吧细菌传给很多虱子,与命题无关.

E 讲除老鼠以外的寄主不携带任何可以被虱子传给人的病菌,这个跟lyme病毫无关系.

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