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标题: [求助]gwd-6-13 [打印本页]

作者: ellenliner 时间: 2008-1-8 19:25
标题: [求助]gwd-6-13

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.

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

弱弱地问一下为什么不选E呢觉得E 挺对的? 大家来帮帮忙啊!

作者: Lily0515 时间: 2008-1-9 05:55
ANS:c??

作者: dphxmg 时间: 2008-1-9 15:09
Lyme <-- bacteria
Lyme<-- deer tick<-- deer tick larvae<-- white-footed mice <-- bacteria

B is the key. B = Negative(Lyme <-- white-footed mice <-- bacteria)

作者: ellenliner 时间: 2008-1-9 18:33

楼上的解释没看懂呵呵不好意思啊答案好象是c 有没有高人指点一下啊

作者: 阿彻 时间: 2009-8-25 16:40
我选的也是B

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