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?

1. Ticks do not suffer any adverse consequences from carrying the bacterium that causes Lyme disease in humans.
2. There are no known cases of a human’s contracting Lyme disease through contact with white-footed mice.
3. A deer tick feeds only once while in the larval stage.
4. A single host animal can be the source of bacteria for many tick larvae.
5. None of the other species on which deer tick larvae feed harbor other bacteria that ticks transmit to humans.

搜过前面的帖子了，前人的对C的看法是如果tick只吃一次，增加其他动物减少传染几率

这里给出我的看法，如果其他动物增加了，就算tick吃多次，吃到mice的几率也会减少

我比较喜欢B，排除了其他因素，如果能够通过mice传染，那加其他动物导致的传染几率不会减少，b排出了这种可能

如果其他动物增加了，就算tick吃多次，吃到mice的几率也会减少

???其它动物增加了？

幼虫吃白老鼠得到了细菌从而感染了人

幼虫还持其它的东西

说其它的东西增加，细菌感染会减少

问加强

C：如果只吃一次，那么其它的东西就是这一次以后唯一的来源，这样的话概率

降低

你说“他动物增加了，就算tick吃多次，吃到mice的几率也会减少”这个不确

定了。

－－－－－－－－－－－－－－－－

如果其它增加的强度小于多吃的次数，即使其它东西增加了，但是几率的概率

还是增加了。

所以是不对的。

文中没有说“如果只吃一次，那么其它的东西就是这一次以后唯一的来源，这样的话概率降低”呀？？？？能解释一些吗？谢谢啦