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.
答案是C,为什么A不对呢?
核实了一下,答案是A,不好意思弄错了,今天已经看晕了
欢迎光临 ChaseDream (https://forum.chasedream.com/) | Powered by Discuz! X3.3 |