GWD13-28

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?

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

 正确答案选C

我选E

E 肯定不对，谈论的是导致lyme的细菌，而没有谈论其它细菌。

除了C其它都肯定不对。

C 的意思不太确定，似乎是如果如果这些TICK幼虫时只吸血一次，就降低了被传染的概率。

问问清楚为什么选C啊?B怎么不对呢?