请教一道加强题！（是讲义上的，不知道来源，请见谅！）

ccccccccccab

Lyme disease is caused by a bacterium transmitted to human by deer ticks. Generally deer ticks pick up the bacterium while in the larva stage from feeding on infected white-footed mice. However, certain other species on which the larva 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 the 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 larva stage.

D.     A single host animal can be the source of bacterium for many tick larva.

E.      None of the other species on which deer tick larva feed harbor other bacteria that ticks transmit to humans.

ccccccccccab

答案选C。为什么咧？

crystal007

是说人们会感染一种disease是由deer ticks所携带的bacterium造成的。deer ticks在larva时期食用一种infected的rice导致携带这个bacterium.但其他几种larva食用的rice不携带该bacterium.结论是减少infected rice的数量，加大其它几种rice的数量，就可以减少携带bacterium的ticks的数量，从而减少人们染病的机会。

A反而是减弱 是说deer ticks携带病菌不会受到负面影响，那它不是更长命百岁吗？

B infected white-footed rice才有问题  如果本题改成infected white-footed rice,那反而是加强。因为否定了人们因食用infected white-footed rice而感染disease的可能。

C将larva feed的次数降到最低。就是一种肯定。即加强。

D一个host animal可以成为许多tick lava bacterium的来源。是削弱。

E 现在是讨论使人们感染上Lyme disease 的病毒，偏离题意。

私人意见，望大牛指教！

ccccccccccab

终于搜到解释了，贴出来~~~~~
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.
L病是通过LT虫传染给人类的一种细菌引起的。大多数情况下LT虫是在幼虫阶段在被感染的白脚老鼠身上觅食时携带上这种病菌的。然而，其他种类的LT虫在幼虫阶段的觅食的宿主不携带这种病菌。因此，如果其他种类的LT虫增加了，携带特定病菌的LT虫数量就会减少，进一步的感染L病的人数量就会减少。

C DT虫只在幼虫时期觅食一次。
就是说它除了觅食时的宿主之外没有别的接触那种细菌的机会。排除了不再白脚老鼠身上吃东西的别的LT虫在别的地方吃东西携带病菌的可能。因此是加强。
这题我是排除出来的，虽然C略有牵强，但是其他四个更离谱。
……这道题终于说完了，GMAC以后希望能够出些不这么恶心的题目，选项恶心，题目内容更恶心。