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.触觉接收器对弱信号不敏感
(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.
3. The author of the passage most probably discusses the function of tactile receptors (lines 7-11) in order to举例作用题
(A) eliminate and alternative explanation of anteaters’ response to electrical stimuli触觉接收器不管用
(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（A）
(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*4 mentioned in the second paragraph?区分两槽水的实验
(A) They are unable to distinguish between stimuli detected by their electroreceptors and stimuli detected by their tactile receptors.
(B) They are unable to distinguish between the electrical signals emanating from termite mounds and those emanating from ant nests.
(C) They can be trained to recognize consistently the presence of a particular stimulus.
(D) They react more readily to strong than to weak stimuli.（C）
(E) They are more efficient at detecting stimuli in a controlled environment than in a natural environment.
5. The passage suggests that the researchers mentioned in the second paragraph who observed anteaters break into a nest of ants*5 would most likely agree with which of the following statements?信息题（有定位）
(A) The event they observed provides conclusive*5A确定的证据，不对 evidence that anteaters use their electroreceptors to locate unseen prey.
(B) The event they observed was atypical没有代表性的，文中没有说 and may not reflect the usual hunting practices of anteaters.
(C) It is likely that the anteaters located the ants’ nesting chambers without正好和文中相反 the assistance of electroreceptors.
(D) Anteaters possess a very simple文中看起来并不简单 sensory system for use in locating prey.（E）
(E) The speed*5E with which the anteaters located their prey is greater than what might be expected on the basis of chance alone.
6. Which of the following, if true, would most strengthen the hypothesis mentioned in lines 17-19?逻辑题（支持题：搭桥法）
(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.文中最后缺一个条件：能探测到蚂蚁身上有电信号
(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.（B）
(E) Anteaters are observed using the same angle used with nests of ants to break into the nests of other types of prey.
责任编辑：虫虫
