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题库 / OG2020-CR-673
Farmer:Several people in the past few years have claimed to have seen a mountain lion in the suburban outskirts—the latest just last month—and, while mountain lions were thought to have been driven from this entire region about twenty years ago, there is no reason for the people who reported seeing a mountain lion to have deliberately concocted a false report. Therefore, local wildlife managers should begin to urgently address the mountain lion's presence.
Which of the following would, if true, most seriously weaken the farmer's argument?
Farmers in the suburban outskirts mostly raise cattle and hogs, which when fully grown are generally not attacked by mountain lions.
Mountain lions are dissimilar in size and color to other wild animals found near the suburban outskirts.
No person who claimed to have seen a mountain lion had anyone else with them at the purported sighting.
There have been no regional reports in the past year of mountain lions migrating to the area.
Recent surveys show that more than half of the people in the region report that they have never seen a mountain lion before.
情景：farmer: 最近有人说自己在郊区看到了狮子，但20年前就狮子就已经被赶出这片区域了。我们没有理由怀疑声称自己看到狮子的人谎报。因此，当地的管理员应该赶紧去证实狮子的存在。
推理：从发生顺序上来说，是先有狮子存在，才能有人看见狮子，所以此为果因推理
（果）前提：有人声称看到狮子
（因）结论：狮子存在
选项分析：
A选项：郊区的农民会养牲畜，当牲畜长大之后也不会被狮子袭击：无关，无法证明到底有没有狮子。
B选项：狮子和郊区附近的其他野生动物在形体和颜色上不一样：一定程度起到了加强作用，排除了农民把别的野生动物当作狮子的可能性。
C选项：正确。那些声称看到狮子的人没有一个是有别人陪同的：没有人可以证实这些农民真的看到了狮子，原因上出了问题，切断了因果联系。起到了削弱作用。
D选项：没有当地的报告称过去几年有狮子迁徙到这篇区域：无关。没有报道不代表没有狮子。
E选项：最近的调查显示，这个区域的人超过一半声称他们之前没见过狮子：与见过或者没见过狮子的人的数量无关。我们要讨论的是到底有没有狮子。
有没有人想过，therefore后面根本不是结论，结论是居民没理由撒谎，前提是20年前狮子就已经被赶走了，这样C就质疑了因果关系。
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