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标题: prep Q24 NN请作答，多谢！！ [打印本页]

作者: guanwzy 时间: 2010-7-6 18:17
标题: prep Q24 NN请作答，多谢！！

这一题选哪个，为啥啊？还有，遇到这种类似的题目应该怎么做呢？
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.Perhaps 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: avalon9527 时间: 2010-7-6 20:32
一个是说T是由于不能维持高速率而需要休息才导致中途有中断，另外的说是由于T不能接受快速变换的视觉信息，以至于停止了。
A是说一个飞虫向着T飞来,T立刻跑走了。
B是说在追虫子时，T能很快的对虫子方向的变化作出反应，并且不管是爬坡还是下坡，T都要同样频繁地中断一会。
C是说T在中断之间的间隔时间是固定的，尽管当飞虫从静止到逃跑时，T都在上一次停顿后加速。
D是说当T中断时还没有抓住虫子，那么一般来说T就放弃追逐了。
E是说如果一个障碍突然出现在奔跑的B前面，那么T立刻就停止了，但T不会绕着障碍跑动。

答案是B。因为B是能最直接的undermine后者的原因而支持前者的论点的。呃。。。对么？欢迎拍砖。。

作者: guanwzy 时间: 2010-7-6 22:38
恩，我在做的时候选的也是B，而且想的跟你完全一样，支持前者反对后者，但是答案是C。。。

作者: avalon9527 时间: 2010-7-6 23:58
嗯，期待NN解答~

作者: helenlife 时间: 2010-7-7 08:03
答案怎么会是C？应该是B啊。

作者: guanwzy 时间: 2010-7-7 09:42
难道我的答案错了。。。

作者: guanwzy 时间: 2010-7-7 17:17
我今天和群里的朋友讨论了一下，他给了两种解释：
其一，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

其二，The reason that C strengthens the alternative hypothesis is that the speed of the beetle did not increase the moment the prey begins to flee, but has to wait until the next pause. This suggests that it did not see that the prey has begun to flee until it paused, which supports the idea that the beetle cannot process the changing visual information because it is running so fast.

这两种都是说他瞎而不累的，我还有一种解释是说他累而不瞎的：
因为它每两次停顿之间的时间是一样的，所以是体力的原因让他停顿；而在猎物起跑的时候它也会跟着加速，说明是它不瞎。

其实都不是特别有说服力，但如果非要硬解释一下的话，我偏向于第二个恩恩。

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