A为什么不对

deezy

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.

2. Loma ants are less effective than many bird species in competing with rodents for seeds.
3. Certain other species of black ants are more effective than Loma ants in competing with rodents for seeds.
4. The sting of Loma ants can also be fatal to rodents.
5. The use of pesticides to control Loma ants could have harmful effects on the environment.

答案是C，为什么A不对呢？

alohabrian

这个题楼主，你确定是选C吗？我看了一下讨论，好像标准答案是A吧。

[此贴子已经被作者于2009-2-17 21:37:35编辑过]

alohabrian

这个题真伤脑筋。

A成立，C不成立。 不能strengthen原文。

C成立，A不成立。 也不能strengthen原文。

定会上来，大家讨论。

deezy

核实了一下，答案是A，不好意思弄错了，今天已经看晕了