GWD-6-13

f430spider

Q13:

Lyme disease is caused by a bacterium transmitted to humansby deer ticks.  Generally deer ticks pickup the bacterium while in the larval stage from feeding on infectedwhite-footed mice.  However, certainother species on which the larvae feed do not harbor the bacterium.  Therefore, if the population of these otherspecies were increased, the number of ticks acquiring the bacterium―and hencethe number of people contracting Lyme disease—would likely decline.

Which of the following, if true, most strengthens theargument?

1. Ticks     do not suffer any adverse consequences from carrying the bacterium that     causes Lyme disease in humans.
   

There     are no known cases of a human’s contracting Lyme disease through contact     with white-footed mice.

A deer     tick feeds only once while in the larval stage.

A     single host animal can be the source of bacteria for many tick larvae.

None     of the other species on which deer tick larvae feed harbor other bacteria     that ticks transmit to humans.
没有看懂题。
是不是有很多版本的GWD31套，因为同样的题号，我的题和别人的不一样诶。。。

jeffreysoon

选最后那个？
我逻辑挺差的，我怕说出来还误导你，呵呵

f430spider

我最开始也选的e, 但是现在看来也不怎么对。答案是C

jeffreysoon

我再分析了一下，你看行吗。。。
文章说的前提是：deer tick把细菌传给人，并且dt传染细菌的方式是它们在幼虫的时候feed white-footed mice的时候传染上的。然后有些white-footed mice是没有携带细菌的
结论：没有携带细菌的white-footed mice越多越好，这样dt才会很少的传染细菌，进而人类才会很少的被传染细菌

E：那些dt feed 的other species中没有一个携带other细菌，这些细菌会通过dt传给人（我觉得E错就错在other细菌这，第一次做题的时候就漏看了这个other）
C：A deer  tick feeds only once while in the larval stage.（如果other species越多，那么dt在幼虫阶段只吃一次，吃到没细菌的mice概率就大，那么人类被感染的概率就小？）

f430spider

yeah, guess that's the only way to make C correct...thx