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标题: 涛涛GWD30-6-13 [打印本页]

作者: ailingzh 时间: 2006-5-28 21:56
标题: 涛涛GWD30-6-13

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

我认为正确答案应该是E，请大家讨论一下。

作者: quanner 时间: 2006-5-28 22:40

答案C

如果the larvae吃没有被感染的other species

且只feed一次的话

那么他们就不吃被感染的white-footed mice

就减少了人们感染L病的机会

E是无关选项,这里没涉及other bacteria,一直只在说

传染L病的病毒

这里充分运用了Lawyer_1说的加强题的特殊性和具体性的方法

作者: ailingzh 时间: 2006-5-29 10:16
明白了。谢谢。

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