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发布时间：2006-06-23 17:06     点击：

　　(D) The amount of electrical stimulation required to excite electroreceptors

　　(E) The amount of nervous activity transmitted to the brain by electroreceptors when they are excited

　　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 electro receptors……

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

　　3. The author of the passage most probably discusses the function of tactile receptors (lines 7-11) in order to

　　(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.

　　4. Which of the following can be inferred about anteaters from the behavioral experiment mentioned in the second paragraph?

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