逻辑cr 旧PREP practice1 的24题，tiger beetles为何要暂停，要休息，还是不能处理移动的视觉信息

sharon20

   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?

(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.

这道题，完全不明白，求选项分析~~~谢谢！！

tianlialice

这道题的问题是下面哪一个选项，支持文章的一个假设，却又同时削弱另一个假设。解释如下：
(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

zwhjzwhj

谁知道这道题按照分类该算哪类题？
应该算特殊题型吧，哪类都不算，问下面哪个support其中一个的同时undermine 另一个？

phoony

这道题的问题是下面哪一个选项，支持文章的一个假设，却又同时削弱另一个假设。解释如下：
(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

-- by 会员 tianlialice (2012/8/29 17:56:12)

提问下：c里面不是讲了是停顿之后才加速的的么 然后一种说法是暂时失明所以停顿，是不是可以得出停顿之后会不失明，所以才加速的呢？

hlhlhlt

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.
这句很容易理解成pause不知是什么原因，反正都是pause，但是这里有stationary begins to flee，也就是原先静止的昆虫改变方位了，而题目中给了beetles是能够迅速扑捉any nonflying insect。如果是失明的话，这个beetle就不知道猎物跑哪去了，就没有必要加速追了。所以是加强休息，削弱失明。

yuki870126

B 为什么不对， 先说它能够根据insects的方向改变方向， 那么说明不是失明， 然后pause equally， 说明每相同的时间段要休息一下， 这样不是削弱了失明 增强了休息么？

迟迟钟鼓

额，我看的MGAMT上Ron的解释是C加强失明，削弱休息。因为a fixed time interval between pauses证明不是因为累才休息，不然追逐的时间一长，Tiger beetles会越来越累才对，休息的间隔会缩短。
although when an insect that had been stationary begins to flee, the beetle increases its speed after its next pause-----证明了当昆虫加速后，beetle没有办法立即反应过来，必须在next pause后才明白应该加速去追，也就是支持了失明的假说。

yuhongkui

迟迟钟鼓 发表于 2014-2-27 12:39
额，我看的MGAMT上Ron的解释是C加强失明，削弱休息。因为a fixed time interval between pauses证明不是因 ...

哥们不累就是定睛观看一下