[求助] TTGWD 6-13 - ChaseDream

以下是引用oneseven在2007-8-25 1:14:00的发言：

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.

Lime 这种病是由于通过deer ticks 传播给人类的一种细菌导致的。通常deer ticks是因为在幼虫期吃了被细菌感染的白脚鼠而携带了这种细菌。但是，一些其它物种不会携带这种细菌的幼虫。所以，如果其它物种的数量增加了，携带这种细菌的deer tick-因而感染Lime这种病的人-可能会减少。

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

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感激

C说deer tick在幼虫期只吃一次。意味着如果其它物种数量增加了，deer tick吃白脚鼠的概率会降低，因而感染细菌的可能性减小。