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  3. Australian researchers have discovered electroreceptors(sensory organs designed to respond to electrical fields)clustered at the

Australian researchers have discovered electroreceptors(sensory organs designed to respond to electrical fields)clustered at the

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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.
Which of the following, if true, would most strengthen the hypothesis mentioned in lines 27-29?
选项 A、Researchers are able to train anteaters to break into an underground chamber that is emitting a strong electrical signal.
B、Researchers are able to detect a weak electrical signal emanating from the nesting chamber of an ant colony.
C、Anteaters are observed taking increasingly longer amounts of time to locate the nesting chambers of ants.
D、Anteaters are observed using various angles to break into nests of ants.
E、Ant eaters are observed using the same angle used with nests of ants to break into the nests of other types of prey.
答案B
解析 哪一个加强L27—29结论?原文结论：食蚁兽用电接收器探测猎物。∴B正确，从蚁穴中发现了弱的电信号。弱电信号，只有电接收器能感应。A．“strong electrical signal”触觉接收器也能感应。C、D、E选项明显不符合。
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