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标题: 求助一道PREP上面的原题，感谢大家了 [打印本页]
作者: Cherliuiking 时间: 2010-1-28 18:47
标题: 求助一道PREP上面的原题，感谢大家了
Every fall Croton's jays migrate south. The jays always join flocks of migrating crookbeaks with which they share the same summer and winter territories. If a jay becomes separated from the crookbeaks it is accompanying, it wanders until it comes across another flock of crookbeaks. Clearly, therefore, Croton's jays lack the navigational ability to find their way south on their own.
Which of the following, if true, most strengthens the argument above?
A. Croton's jays lay their eggs in the nests of crookbeaks, which breed upon completing their southern migration.
B. The three species most closely related to crookbeaks do not migrate at all.
C. In the spring, Croton's jays migrate north in the company of Tattersall warblers.
D. Species other than Croton's jays occasionally accompany flocks of migrating crookbeaks.
E. In the spring, crookbeaks migrate north before Croton's jays do.
答案选A，为什么呢？
作者: prayer 时间: 2010-1-28 20:03
答案是C，不是A
作者: prayer 时间: 2010-1-28 20:04
mikrodj wrote:
Premise 1: Every fall Croton's jays migrate south.
Premise 2: The jays always join flocks of migrating crookbeaks with which they share the same summer and winter territories.
Premise 3: If a jay from the crookbeaks it is accompanying, it wanders until it comes across another flock of crookbeaks.
This implies that a jay needs a flock to migrate south.
Conclusion: Croton's jays lack the navigational ability to find their way south on their own.
Consider the following problem (perhaps not the best analogy)
David goes to the gym every Wednesday. Every time David goes to the gym, Richard goes with him. If Richard stops to buy something, David waits for him. Clearly, David lacks the navigational ability to find the way to his gym.
what would strengthen this argument?
Every time that David needs to go to the University, he calls Richard to find the way. If the author said that David can go on his own to the university this would hamper the conclusion that David lacks navigational ability.
Regarding the problem
(A) Croton's jays lay their eggs in the nests of crookbeaks which breed upon completing their southern migration.
does this account for the lack of navigability of the croton's jay?
Let me know if this helps. I know my explanation might be not really clear
来自manhattan的解释
作者: Cherliuiking 时间: 2010-2-1 17:24
谢谢，prayer nn
作者: verssy 时间: 2013-9-29 19:47
你们难道没有人觉得这题应该选E吗？
作者: 醒醒Shine 时间: 2014-3-31 14:26
非常弱地问一句，这个crookbeak和C选项的Tattersall warblers一定是同一个东西吗？光做这题的时候，真的不知道啊！
大家做题的时候怎么合理推断的呢？
作者: 小皮麽西瓜 时间: 2014-6-26 07:31
醒醒Shine 发表于 2014-3-31 14:26 
非常弱地问一句，这个crookbeak和C选项的Tattersall warblers一定是同一个东西吗？光做这题的时候，真的不 ...
刚好在看寂静碰到这道题。。如果问strengthens就选C，因为C中说jays它再返回北方时还是要跟着别人才能回来，说明没方向感， warbler只是“别人”的一个例子，也可以换成其他的鸟；如果问weaken就选A， 因为去南方时跟着别的鸟，不是因为没方向感，而是有其他的因素，如要下蛋在别人窝里。。。。
作者: 醒醒Shine 时间: 2014-7-1 20:10
小皮麽西瓜 发表于 2014-6-26 07:31
刚好在看寂静碰到这道题。。如果问strengthens就选C，因为C中说jays它再返回北方时还是要跟着别人才能回 ...
这个解释清晰多了，谢谢！
作者: 一只酵母君 时间: 2016-5-7 21:19
顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶
作者: 猪小王 时间: 2017-2-28 06:35
同意！
作者: suk1yan 时间: 2017-7-12 11:44
感觉题目有问题呀~到底题目是以“这种鸟找不着南”作为结论，还是以“这种鸟没有方向感”作为结论？如果以前者的“这种鸟找不着南”为结论，（也是题目的意思），只要选出能证明它“找得着北”的选项就可以了。那么E选项说：这种鸟回北方的时候不需要同伴陪同（带路），即能找得找北，就是正确选项。如果结论是“这种鸟没有方向感”为结论，才是选的C。
作者: VikingYu 时间: 2017-10-30 17:18
同意这两种差异的划分！
如果，题目给的结论只是——这种鸟找不着南
那么，由于C佐证的是鸟找不着北；所以C应该属于无关选项，无法加强原论证……
换一个例子
前提：小花每次去幼儿园都要妈妈陪，妈妈不在她就等妈妈来了才去幼儿园
结论：小花没有从家里到幼儿园的方向感
这时候“小花从家到楼下小卖部需要爸爸陪”，貌似没办法说明“小花没有从家里到幼儿园的方向感”吧……
作者: TuesdayA 时间: 2018-9-13 14:12
跟楼上的两位同胞想到一块儿去了～
作者: kluivert 时间: 2018-9-13 15:33
题目结论是：这种鸟没向南迁徙的导航能力
C选项直接否定了这种鸟有导航能力（不管向东南西北） ，都得跟着别的鸟飞
E说crookbeaks比这种鸟先向北迁徙 ，这不能说明任何问题。纯粹无关 ... 在E的前提下，这种鸟有可能自己稍后自己飞回北方，又或跟着别的鸟飞
作者: TuesdayA 时间: 2018-9-14 12:41
我又来啦！
来自Ron:
" ok, i see what you guys are saying. so, it's time to apply the reasonableness test - which of these two is more reasonable? let's simplify this:
which of the following is more likely to strengthen the idea that the jays cannot fly south on their own?
(c) they can't fly north on their own, either.
(e) they CAN fly north on their own.
in this simplified version, it should be obvious that (c) is better than (e)."
作者: jackslin 时间: 2018-10-13 16:36
感谢分享！
作者: wu0h961738 时间: 2020-3-2 14:56
本串唯一標準答案
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