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标题: 此题答案为C,跪求解释 [打印本页]

作者: harvard2012 时间: 2011-6-12 11:27
标题: 此题答案为C,跪求解释
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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

作者: colasama 时间: 2011-6-12 12:05
H1：累了要停
H2:太快，看不清要挺

E:SUPPORT了2，但是没有undermine 1

C:两次停的时间间隔一样~~无论快慢。说明不是累的问题，undermine 1;
当猎物由静止变成逃跑，bettles在下次停了再启动后，速度会更快。support 2
support方法我想到两个
a.猎物开始逃跑，bettles能够用更快的速度去追它可能是因为相对速度小了，能用更快的速度仍能看清猎物
b.不是马上加速，而是下次停了再加速。很可能跑的时候是blind的，停了才看清调整

当然b最靠谱..a锻炼想象力~~哈哈

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