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标题: 求助一道逻辑题，费解中 [打印本页]

作者: xingxc11 时间: 2011-7-27 00:10
标题: 求助一道逻辑题，费解中
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.

erhaps 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 请NN们帮忙分析一下吧

作者: marque 时间: 2011-7-27 22:49
我觉得题目说一种虫TB飞会儿停会儿，假设一：它太累，飞会儿就歇会儿；假设二：它眼睛不好，猎物来个急转弯它就看不清猎物了。

要削弱一个，加强一个。

要你来做实验肯定会这样做：放一个不怎么急转弯的猎物，让TB去追。如果它仍然飞会儿停会儿，证明它体力不好；如果它不停，那么证明以前它停是因为眼睛不好。

其实也是控制变量法吧。

一家之言，请指正

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