以下是引用wanderdream在2005-8-1 20:56:00的发言: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?
D的意思是tactile receptors在强电场下比electroreceptors更容易反应,这个文章并没有说 |