|
人通过接触deer，就会染一种病，而deer是因为吃white mouse（好像是）才有这种病毒的。因此，增加除了whilte mouse以外的deer的食物种类，就可以减少人类染上那种病的概率。问哪个增强？选Deer在什么Staple环境中只进食一次的选项。就吃一次当然吃whilte mouse的概率小了。。。 楼主遇到的是不是这题？ 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 whitefooted 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. | 
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2008-12-28 00:22:00
楼主