题目

求解一道GRE逻辑题!为什么正确答案是E?
2.Spiders of many species change color to match the pigmentation of the flowers they sit on.The insects preyed on by those spiders,unlike human beings,possess color discrimination so acute that they can readily see the spiders despite the seeming camouflage.Clearly,then,it must be in evading their own predators that the spiders’ color changes are useful to them.Which of the following,if true,most strengthens the argument?
　　(A) Among the animals that feed on color- changing spiders are a few species of bat,which find their prey through sound echoes.
　　(B) Certain animals that feed on color-changing spiders do so only sparingly in order to keep from ingesting harmful amounts of spider venom.
　　(C) Color-changing spiders possess color discrimination that is more acute than that of spiders that lack the ability to change color.
　　(D) Color-changing spiders spin webs that are readily seen by the predators of those spiders.
　　(E) The color discr

提问时间：2021-01-02

答案

原文提供的信息如下：（1）有些蜘蛛会变色（2）但这些蜘蛛的猎物仍能清晰辨别蜘蛛,他们对色彩的辨别能力很强（不像人类这么弱!）（3）既然蜘蛛的变色不能帮助它们捕猎,那么变色的原因就只能是逃避天敌了.问：下面哪个陈述最能支持这种观点?
A 蜘蛛天敌中包括某些种类的蝙蝠,它们靠回声定位捕猎.【这并不能说明蜘蛛通过变色能更好地逃脱,所以不对】
B 有些吃变色蜘蛛的动物不敢多吃,怕中毒.【与问题无关】
C 变色蜘蛛比不变色的蜘蛛更能分辨颜色.【还是对逃跑没有帮助】
D 变色蜘蛛织的网很容易被捕食者发现.【还是与蜘蛛变色无关】
E 捕食变色蜘蛛的某些鸟类,其分辨颜色的能力并不比人类更好.【题目中提到了人类分辨颜色的水平不高,如果这些天敌也不怎么会分辨颜色,那么蜘蛛就可以通过变色逃脱了.注意：本文中的color discrimination应该是指透过变化的颜色看到本质的能力】