prep上的一道逻辑题，求好心的nn指导！

mivoylee · 发表于 2018-10-29 22:46:25

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.

这道题按照我的思路是因果推理，
因：因为ticks在幼年时吃白足鼠会感染，但他们也可以吃其他的动物，而其他动物数量上升，ticks会去吃其他动物
果：所以ticks被感染的数量会下降
削弱方向是反驳果或反驳因果之间的联系

我明白正确答案b的原因，但是d选项还是觉得很难理解，d也完全可以反驳果呀？如果ticks在成年之后会通过其他方式感染的话，那么最终ticks被感染的数量就不会下降，就算他们在幼年时没感染长大了还是会被感染

求nn帮忙解释一下非常感谢！

prep上的一道逻辑题，求好心的nn指导！

所属分类: GMAT考试

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