请教Prep-1-24

floraxycn

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.

答案是C,为什么呢?麻烦解释一下，谢谢！

tasteofbit

C说beetles每两次休息之间的间隔是固定的。即使虫子要逃走了，它也只会停顿后再加速。

这个答案说明了beetles是因为体力不支而不是因为盲了而停顿。因此是支持第一种假设而非第二种。

floraxycn

明白了，谢谢！

zhangqing74

还是不明白。C怎么能看出来是undermine第二种假设呢？

lulu_odin