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标题: TTGWD6-13 [打印本页]

作者: xiaobenzhu 时间: 2006-9-30 09:56
标题: TTGWD6-13

Q13:

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?

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.

I don't know why the answer is C, can sb. tell me how to analyze it?
Thanks.

作者: xiaobenzhu 时间: 2006-9-30 23:31
up

作者: sinoversion 时间: 2006-10-1 14:29

题目说:因为它吃的(被喂)哪个鬼东西有病,所以传染给了它,然后它传染给了人.那么,只要喂它吃个没病的就可以降低传染几率.

现在要support

A deer tick feeds only once while .

小犊子in the larval stage喂一次就够了,说明它不会再去吃其他有可能带菌的事物了,加强!

作者: xiaobenzhu 时间: 2006-10-2 08:00
Thanks a lot.

作者: lguo1 时间: 2006-10-7 17:12
I'm sorry I still have some doubt on this one. My question is how about B?



In the following sentence, it draws conclusion that if the number of
ticks acquiring the bacterium decreases, then the number of people
contracting Lyme disease would likely decline:

    the number of ticks acquiring
the bacterium―and hence the number of people contracting Lyme disease—would
likely decline.



But if people may possibly contract Lyme disease from other
sources other than deer ticks, then excluding those

other infection sources will strenghthen the original argument.



I think B excludes 1 other such possible infection source, therefore strenghens the original argument :

People will not contract Lyme disease through contact with
white-footed mice



Probably I think too much?



Thanks!

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