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标题: 求助一道逻辑题 [打印本页]

作者: cdxiaobao 时间: 2009-11-7 18:47
标题: 求助一道逻辑题
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.

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?

(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.

求助为何B不对，C对呢~~请好心人指点~

作者: cdxiaobao 时间: 2009-11-7 21:08
大家有一点思路也可以说说呀~

作者: daliliu 时间: 2009-11-7 22:55
试分析一下。有2个理论-第1个是说要定期休息一下，第2个说太快了反而看不清了，所以要挺一下。问怎么样设计一个实验，去证明只有一个理论正确。B前半句否定了第2个理论，后半句肯定了第一个理论。所以OK。C好像没提到第2个理论

作者: AimforHigher 时间: 2009-11-9 10:48
B 錯是因為它變成同時 support兩個hypothesis, C是只支持第一個hypothesis

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