大全－47-5 求解

gedn01

Australian researchers have discovered electroreceptors (sensory organs designed to respond to electrical fields) clustered at the tip of the spiny anteater’s (spiny anteater: n. 〈动〉针鼹) 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(1.d;2.c).

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 (oblique angle: 斜角(包括锐角和钝角)) 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.
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.-->这句话后半部分不懂,特别是chance alone两个放在一起，他们指的是什么

irisfrance

同问。。。这道题我也做错。。。选了A  好像不是suggest出来的 。。。呵呵 不懂E后半句。。。

DeliciaAn

先说下自己认为A为什么不对的原因：
(A) The event they observed provides conclusive（令人信服的，确凿的） evidence that anteaters use their electroreceptors to locate unseen prey. researchers as yet have been unable to detect electrical signals emanating（放射，发出） from termite mounds  这并不能体现出来确凿的。因为还不能able to detect electrical signals emanating from termite mounds(一堆)

E选项：
(E) The speed with which the anteaters located their prey is greater than what might be expected on the basis of chance alone.
on the basis of chance alone,就是指偶然机会得到的结论（expected)
就是说anteaters locate their prey的速度要明显的快于期望中的单凭是偶然机会（就是比较幸运时）获取猎物的速度。其实就是说anteaters 根据electroreceptors找猎物而不是偶然的机会找到的猎物。就是用electroreceptors找猎物的速度要比仅仅凭chance找到猎物的速度要快。

以上为个人的一点浅见，如果有nn发现不对的地方，请及时指正，感激不尽！