GWD 6-13

[小小白]

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?

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.

說來慚愧,本人連題目都看不是很懂,請問各位答案為何是C.

[keane0727]

C對
no bacterium/bacterium值愈大時, tick愈可能feed on a mice with no bacterium，但是隨著進食的次數增加，吃到 mice with bacterium的機率也增加

因此C說deer tick in larval stage只進食一次，有support的味到