GWD-13-31一道逻辑题，求大神指教！！

刘小谁

GWD-13-31
By competing with rodents for seeds, black ants help control rodent populations that pose a public health risk.  However, a very aggressive species of blank ant, the Loma ant, which has recently invaded a certain region, has a venomous sting that is often fatal to humans.  Therefore, the planned introduction into that region of ant flies, which prey on Loma ants, would benefit public health.
Which of the following, if true, most strengthens the argument?
A. Ant flies do not attack black ants other than Loma ants.
B. Loma ants are less effective than many bird species in competing with rodents for seeds.
C. Certain other species of black ants are more effective than Loma ants in competing with rodents for seeds.
D. The sting of Loma ants can also be fatal to rodents.
E. The use of pesticides to control Loma ants could have harmful effects on the environment.


GWD上的答案给的是A，我选的是C
我觉得A与题中的话“which prey on Loma ants”
而C选项说，其他的蚂蚁比L更高效，也就是说消灭了L不会使与rodent的竞争变弱而影响公共健康，排除它因，从而加强了结论啊，那为什么不能选C呢？？


还求大神指教啊！！！

DUKB24

My methodto deal with CR problem is to deal with the stimulus first and then look at the question stem and finally the choices.
To better crack the CR problem，you must learn to diagram.

Premise：black ants help control rodent that pose a public health risk.（conducive to human）Premise：a very aggressive species of blank ant，Loma ant，is harmful to humans.
Conclusion：the planned introduction into that region of ant flies, which prey onLoma ants, would benefitpublic health.


You must first consider if thereis any reasoning error present.how can the author conclude this statement？Is there any possibility thatauthordo not consider？in order for his argument to be
solid，it must take for granted that the introduction of flies will not kill black ants，which play an important rolein public health.

C is a typically wrong answer.Thereis other species existing play no role in evaluating this argument. Assume C isthe scenario,can the argument be more strong？what is the properties of this kind of ant？would they pose health risk tohuman？if YES，then is the flies can also control it？If NO，there is no such a need for control.（the argument is superfluous）.Since the informationin the passage is limited，any speculative statement is untrue..

199249712

非NN 不过当初也错过这个题。。。 楼上已经回复的很好啦 我就补充一个自己改错本上的图

[attachimg]99828[/attachimg]

绿色的是结论 任何作用于逻辑链外面的东西都是错误的
偶们经常看到的一种错误选项的表达 类似 A is the only way to do it...or A is more likely to do it 也是同样的道理  我们只在乎promise --- conclusion的作用是否成立 不在乎其他的东东

刘小谁

My methodto deal with CR problem is to deal with the stimulus first and then look at the question stem and finally the choices.
To better crack the CR problem，you must learn to diagram.

Premise：black ants help control rodent that pose a public health risk.（conducive to human）Premise：a very aggressive species of blank ant，Loma ant，is harmful to humans.
Conclusion：the planned introduction into that region of ant flies, which prey onLoma ants, would benefitpublic health.


You must first consider if thereis any reasoning error present.how can the author conclude this statement？Is there any possibility thatauthordo not consider？in order for his argument to be
solid，it must take for granted that the introduction of flies will not kill black ants，which play an important rolein public health.

C is a typically wrong answer.Thereis other species existing play no role in evaluating this argument. Assume C isthe scenario,can the argument be more strong？what is the properties of this kind of ant？would they pose health risk tohuman？if YES，then is the flies can also control it？If NO，there is no such a need for control.（the argument is superfluous）.Since the informationin the passage is limited，any speculative statement is untrue..

-- by 会员 DUKB24 (2012/5/1 16:15:31)

恩恩....好像是理解了，貌似是我太想当然了，用原文没有提供的信息作为答案了...囧rz...谢谢大牛牛~

刘小谁

非NN 不过当初也错过这个题。。。 楼上已经回复的很好啦 我就补充一个自己改错本上的图

99828

绿色的是结论 任何作用于逻辑链外面的东西都是错误的
偶们经常看到的一种错误选项的表达 类似 A is the only way to do it...or A is more likely to do it 也是同样的道理  我们只在乎promise --- conclusion的作用是否成立 不在乎其他的东东

-- by 会员 199249712 (2012/5/1 16:31:22)

谢一个谢一个~终于领会鸟...囧rz...~~