[求助]OG11-65

小鹿和小兵

我也对这道题有问题，现在明白了，谢谢！

stellachan

谢谢!!明白了

发现我问的就是弱智题。。

badground

Australian researchers have discovered electroreceptors (sensory organs designed to respond to electrical fields) clustered at the tip of(说明是snout的顶端而不是全部) the spiny anteater's snout. The researchers made this discovery by(如何得出以上结论) exposing small areas of the snout to extremely weak electrical fields(试验手段,注意small areas, 说明是对snout分多个部位一部分一部分进行测试,而不是一次性测试整个snout) 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.

分析:研究者得出的结论只有在snout的一部分区域对试验手段中extremely weak electrical fields没有反应的时候,才能得出at the tip这个结论, 所以是C

stellachan

来人啊

stellachan

顶上来

stellachan

          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.

65.      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.

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

用排除法选了C

但是不明白为什么