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标题: 【有人做旧prep逻辑么】？？ [打印本页]

作者: winow 时间: 2010-10-22 14:32
标题: 【有人做旧prep逻辑么】？？
题目怪怪的而且没什么讨论帖怎么回事呢？

作者: shijiaxin13 时间: 2010-10-22 14:51
有啊··我们都做了啊··哪里怪啊···

作者: winow 时间: 2010-10-22 14:54
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.

sea urchins跑得很快，可以追上任何不能飞得虫子。但是它跑得时候时常停顿，然后继续追击。可能是因为它不能保持速度，必须要停下来休息，另外一种假设是它跑得时候不能很快的对景物变换做出反应，因此失明停了下来。
两个原因，一个是休息一个是失明

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.
说明没有失明，并且without its usual intermittent stopping.说明不用休息，两个都反驳
(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.
很快做出反应说明没有失明，但是并没有支持是休息
(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.
正确，飞行的时间相同，在停顿之后加速，说明停顿是为了休息，如果是失明就不会加速追击。
(D) If, when a beetle pauses, it has not gained on the insect it is pursuing, the beetle generally ends its pursuit.
如果在停顿的时候没有抓住猎物，它就放弃了，说明不是失明，但是也没有支持休息
(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.
只是说支持失明，但是没有反对休息

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