OG17篇里的一道题（105）

Australian researchers have discovered electroreceptors (sensory organs designed to respond to electrical fields) clustered at the tip of the spiny anteater’s snout. The researchers made this discovery by exposing small areas of the snout to extremely weak electrical fields and recording the transmission of resulting nervous activity to the brain. While it is true that tactile receptors, another kind of sensory organ on the anteater’s snout, can also respond to electrical stimuli, such receptors do so only in response to electrical field strengths about 1,000 times greater than those known to excite electroreceptors.

Having discovered the electroreceptors, researchers are now investigating how anteaters utilize such a sophisticated sensory system. In one behavioral experiment, researchers successfully trained an anteater to distinguish between two troughs of water, one with a weak electrical field and the other with none. Such evidence is consistent with researchers’ hypothesis that anteaters use electroreceptors to detect electrical signals given off by prey; however, researchers as yet have been unable to detect electrical signals emanating from termite mounds, where the favorite food of anteaters live. Still, researchers have observed anteaters breaking into a nest of ants at an oblique angle and quickly locating nesting chambers. This ability quickly to locate unseen prey suggests, according to the researchers, that the anteaters were using their electroreceptors to locate the nesting chambers.

Question:

5.     The passage suggests that the researchers mentioned in the second paragraph who observed anteaters break into a nest of ants would most likely agree with which of the following statements?

(A) The event they observed provides conclusive evidence that anteaters use their electroreceptors to locate unseen prey.

(B) The event they observed was atypical and may not reflect the usual hunting practices of anteaters.

(C) It is likely that the anteaters located the ants’ nesting chambers without the assistance of electroreceptors.

(D) Anteaters possess a very simple sensory system for use in locating prey.（E）

(E) The speed with which the anteaters located their prey is greater than what might be expected on the basis of chance alone.

用排除法可以排除ABCD 但是我不明白从文章哪里可以读出E中黄颜色的部分？

E中黄颜色部分确实不能从文中推出。但什么叫chance alone（单靠偶然）呢？就是食蚁兽的定位法只要有一点点作用，可以加快找蚁穴的速度，该选项就是正确的了。

其实，A选项易误选。它有一定的正确性，但conclusive绝对化了，就形成和文中相反的意思了。

OG的解释供参考：
The best answer is E. The last sentence in the passage implies that the researchers believed that the anteaters’ locating of their unseen prey was too prompt and too deliberate to be accidental. Choice A is incorrect: researchers were unable to confirm that the anteaters’ favorite prey, termites, emitted electrical signals, and the observation of anteaters locating ants’ nesting chambers “suggests” (lines 25), rather than proves conclusively, that anteaters use their electroreceptors to find prey. Choice B is incorrect because here is no indication in the passage that researchers believed that the anteaters’ behavior was atypical. Choice E is incorrect because, according to lines 24-27, the researchers believed that the anteaters “were using their electroreceptors to locate the nesting chambers”. Choice D is contradicted by the passage: in line 13, the anteater’s sensory system is described as “sophisticated”.

看OG解释，认为A选项里的conclusive与原文里的suggest语气不一致 我记得后面还有篇文章有一题是推断作者态度的，也是根据文章里一个adv“ presumably”推断出来的。

我个人认为从您highlight的部分可以看出食蚁兽用娴熟的手法迅速的打开了白蚁巢穴，这样暗示着食蚁兽很可能是用某种方法而不是瞎蒙的，如果是瞎蒙的，它就不可能那么从容迅速。而且文章前面又说reasearcher不能探测出白蚁的弱电场，所以不能肯定它用electroreceptors.

我对E选项的理解是（注意语气）：如果认为食蚁兽定位蚁穴是单靠偶然的话，这个的速度是比预想的要快。也就是说，食蚁兽不是预想的那样单靠偶然来定位蚁穴的，是electroreceptors起了作用才能这么快的。正好符合文中reserchers的观点，所以选E。

不知道这样理解对不对？

另外，我认为一定要给suggest和conclude划清界线，真的是有点牵强！一般情况下不是都把它们当作是得出结论的标志词吗？既然是结论，就不存在什么绝对不绝对的问题。就像做GMAT的题，选了A就等于向ETS表示你认定是A而不是B、C、D、E，没有什么好商量的！

关于本题

1。关于A

A is incorrect: researchers were unable to confirm that the anteaters’ favorite prey, termites,emitted electrical signals,

原文有“HOWEVER "作标志

and the observation of anteaters locating ants’ nesting chambers“suggests” (lines 25), rather than proves conclusively, that anteaters use their electroreceptors to find prey.

此处OG明确表示 SUGGEST 与 CONCLUSIVELY 语气不一致。

1。关于E

The last sentence in the passage implies that the researchers believed that the

anteaters’ locating of their unseen prey was too prompt and too deliberate to be accidental.

同意 wangyu73cn 的解释。

所以，我觉得OG的解释不够说服力。

2.     Which of the following can be inferred about the experiment described in the first paragraph?

(A) Researchers had difficulty verifying the existence of electroreceptors in the anteater because electroreceptors respond to such a narrow range of electrical field strengths.

(B) Researchers found that the level of nervous activity in the anteater’s brain increased dramatically as the strength of the electrical stimulus was increased.

(C) Researchers found that some areas of the anteater’s snout were not sensitive to a weak electrical stimulus.

(D) Researchers found that the anteater’s tactile receptors were more easily excited by a strong electrical stimulus than were the electroreceptors.（C）

(E) Researchers tested small areas of the anteater’s snout in order to ensure that only electroreceptors were responding to the stimulus.

如何排除D呢？

文章说tactile receptors需要的电场力是eletroreceptors需要的1000倍，不能说明tactile receptors对强的电刺激更加容易反应吗？

105题选E而不选A,是否可以这样理解，因为L19有个However，，就表明其后的内容都是researchers……unable，且L22有个still，表示此有的内容还归上面的however管，而不是L24中的ability……suggests……所要表示的，即这个suggest要表示的是句反话， 其实际意义是：unable suggest.

这样理解可以吗？请大家指教！