Tiger beetles are such fast runners that they can capture virtually any nonflying insect. However, when running toward an insect, the beetles intermittently stop, and then, a moment later, resume their attack. Perhaps they cannot maintain their pace and must pause for a moment's rest; but an alternative hypothesis is that while running tiger beetles are unable to process the resulting rapidly changing visual information, and so quickly go blind and stop.
Which of the following, if discovered in experiments using artificially moved prey insects, would support one of the two hypotheses and undermine the other?
24.(29155-!-item-!-188;#058&003857) Tiger beetles are such fast runners that they can capture virtually any nonflying insect.However, when running toward an insect, the beetles intermittently stop, and then, a moment later, resume their attack.Perhaps they cannot maintain their pace and must pause for a moment's rest; but an alternative hypothesis is that while running tiger beetles are unable to process the resulting rapidly changing visual information, and so quickly go blind and stop.
Which of the following, if discovered in experiments using artificially moved prey insects, would support one of the two hypotheses and undermine the other? (A) When a prey insect is moved directly toward a beetle that has been chasing it, the beetle immediately turns and runs away without its usual intermittent stopping.
(B) In pursuing a moving insect, the beetles usually respond immediately to changes in the insect's direction, and pause equally frequently whether the chase is up or down an incline. (C) The beetles maintain a fixed time interval between pauses, although when an insect that had been stationary begins to flee, the beetle increases its speed after its next pause.
(D) If, when a beetle pauses, it has not gained on the insect it is pursuing, the beetle generally ends its pursuit. (E) When an obstacle is suddenly introduced just in front of running beetles, the beetles sometimes stop immediately, but they never respond by running around the barrier. 其他没什么好说的，B和C有很大问题！！！ 主要是对于C怎么理解？？？ 观点一：C说虫子停顿是因为视力不好——解析：本题原文重心甲虫飞时要停的两个假设，一是速度跟不上，二是需要调整视线，要求支持一个。B追猎物时， beetles的转变， 虽然两个都谈到了，但是方向不对，两个假设都否定了，原文要支持一个 。C beetles休息间隙固定的，可以推出不是速度跟不上，但即使这样，还是要pause，所以支持了调整视线看准方向加速的假设 正确（摘自英吉） 观点二：C说虫子停是为了休息，因为体力不足—(C) The beetles maintain a fixed time interval between pauses, although when an insect that had been stationary begins to flee, the beetle increases its speed after its next pause.正确，飞行的时间相同，在停顿之后加速，说明停顿是为了休息，如果是失明就不会加速追击。（摘自3M）
谢谢楼主，我第一次做的时候也是观点2的想法。但是现在支持停顿是为了调整视觉。 仔细读C选项：although when an insect that had been stationary begins to flee, the beetle increases its speed after its next pause. 尽管静止的昆虫开始逃跑了，甲虫要等到下一次停顿后才加速。说明停顿是调整视觉的，调整之后它才会去追昆虫，如果是为了休息的话它应该一开始就加速了，然后为了保持速度休息一下。 不知道我的理解是否正确。
谢谢楼主，我第一次做的时候也是观点2的想法。但是现在支持停顿是为了调整视觉。 仔细读C选项：although when an insect that had been stationary begins to flee, the beetle increases its speed after its next pause. 尽管静止的昆虫开始逃跑了，甲虫要等到下一次停顿后才加速。说明停顿是调整视觉的，调整之后它才会去追昆虫，如果是为了休息的话它应该一开始就加速了，然后为了保持速度休息一下。 不知道我的理解是否正确。
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发表于 2011-10-30 13:46:14
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