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  3. Australian researchers have discovered electroreceptors(sensory organs desig

Australian researchers have discovered electroreceptors(sensory organs desig

游客2024-01-13  79
问题     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 electro-receptors.
    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, re- searchers 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 electrorecep- tors to locate the nesting chambers. [br] The author of the passage most probably discusses the function of tactile receptors(lines 10-17)in order to
选项 A、eliminate and alternative explanation of anteaters ’ response to electrical stimuli.
B、highlight a type of sensory organ that has a function identical to that of electroreceptors.
C、point out a serious complication in the research on electroreceptors in anteaters.
D、suggest that tactile receptors assist electroreceptors in the detection of electrical signals.
E、introduce a factor that was not addressed in the research on electroreceptors in anteaters.
答案 A
解析 作者为什么在L10—17讨论触觉接收器?A．正确。去掉一个关于食蚁兽对电流起反应的另一个解释。即触觉接收器的解释。B．强调一感觉器官和电接收器有同样作用。两者作用不是identical。C．指出研究电接收器复杂。D．指出触觉帮助电接收器探测电信号。E．举出研究电接收器时没考虑的因素。这三者都不符原文叙述。
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