|
以下是引用zhangnannan在2006-11-14 12:39:00的发言：
请问有没有人知道GWD的CR中有rabbit 吃被病毒感染的mice 那道题具体是哪一道啊？ thanks 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 bacterium for many tick larvae.
- None of the other species on which deer tick larvae feed harbor other bacteria that ticks transmit to humans
C 晕死，物种记错了，是DEER，原文是这道题，记性不好真的不适合写机经。。。  | 
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2006-11-10 20:56:00
楼主
