天山-7-13

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 whitefooted
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 bacteria for many tick larvae.
E. None of the other species on which deer tick larvae feed harbor other bacteria that
ticks transmit to humans.

MINE E

ANS C

盼讨论

谢谢

E irrelavantly deals with other bacteria which are not pertaining to the conclusion of the argument.

C is better since the fewer of times the tick feed during larval stage, the fewer the changes to be infected.

hope I made myself clear

neverblack, 文中讨论的是会导致Lyme disease 的细菌， E说的是其他的细菌，所以是无关的选项。

但是E说其他种类的细菌减少了,不也达到目的吗?为什么是无关呢?

望指教

那位牛人可以解释一下E为什么不对。

不好意思,突然搞懂了。

不好意思想请教一下d为什么不对

寄主动物是多个larve感染的源头，就是说他的影响很大。

所以当一种不含某细菌的寄主数量大量增加时，感染的就少了

水平很菜，理解错误的话不要见笑

为什么我觉得没有一个答案是对的?

C说tick只feed一次,所以减少了感染的机会,是这样加强的吗?这个加强足够了吗?

总觉得不能说服自己,

有谁想通了吗?

sorry啊...原来另外一个帖子里已经讲得很清楚了...

http://forum.chasedream.com/dispbbs.asp?boardid=24&star=2&replyid=826616&id=83632&skin=0&page=1

下次已经先搜索再发...