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标题: 一道逻辑题，帮忙解释一下~ [打印本页]

作者: yueqianchen 时间: 2010-2-5 23:36
标题: 一道逻辑题，帮忙解释一下~
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：C

牛人帮忙解释一下，我怎么看C都是两个加强，倒是B是加强假设2削弱1

作者: Sherry_Wong 时间: 2010-2-6 01:20
引用一下他人的
-- 作者：miaoyin_tx
-- 发布时间：2009-1-8 19:36:00
--

Assumption 1: 累 Assumption 2 : 瞎

正确答案必须是支持一个并反对另一个，也就是要么累而不瞎，要么瞎而不累。

下面分析选项：

(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.

respond
immediately ：不瞎

pause equally frequently whether the chase is up or down an incline：是说他无论上坡下坡的情况下都一个速度，说明不累

(D) If, when a beetle pauses, it has not gained on the insect it is pursuing, the beetle generally ends its pursuit.

generally ends its pursuit：不瞎，但累不累不清楚

(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.

although when an insect that had been stationary begins to flee ：瞎，猎物都跑了，他还追

beetle increases its speed after its next pause. 还能加速，说明不累

所以只有C 是说他瞎而不累

作者: yueqianchen 时间: 2010-2-6 15:50
谢谢了，我一直以为相同间隔停顿是为了说明累的，原来是用能不能加速来说明累不累

PS：我一开始怎么没有搜到这道题的答案？？？

作者: Sherry_Wong 时间: 2010-2-6 16:03
我是"题目"GOOGLE的

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