24. (29155-!-item-!-188;#058&003857)
Tiger beetles are such fast runnersthat they can capture virtually any nonflying insect. However, when running toward an insect, thebeetles intermittently stop, and then, a moment later, resume theirattack.  erhaps they cannot maintaintheir pace and must pause for a moment's rest; but an alternative hypothesis isthat while running tiger beetles are unable to process the resulting rapidlychanging visual information, and so quickly go blind and stop.
Which of the following, ifdiscovered in experiments using artificially moved prey insects, would supportone of the two hypotheses and undermine the other?
(A) When a prey insect is moveddirectly toward a beetle that has been chasing it, the beetle immediately turnsand 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 fixedtime interval between pauses, although when an insect that had been stationarybegins to flee, the beetle increases its speed after its next pause.
(D) If, when a beetle pauses, ithas not gained on the insect it is pursuing, the beetle generally ends itspursuit.
(E) When an obstacle is suddenlyintroduced just in front of running beetles, the beetles sometimes stopimmediately, but they never respond by running around the barrier.
B、C选项分别求解释。我觉得C选项是说明了beetles停下来是因为体力更不上而不是视力问题，但是B选项不也是说明了Beetles视力很好，但是还是会停下来equally frequently，不是正说明了是体力的原因吗？
| 
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2012-10-13 22:26:47
收藏
收藏
