不到一周就要考了，请教大家!

沧海一粟520

答案是C 它是怎么削弱一个，支持另一个的？

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.

[此贴子已经被作者于2009/8/8 1:28:40编辑过]

雨落秋池

看不清楚哦，MM发错了版，呵呵

mozhiyu

我想是不是"increase its speed"加强了题目中的"cannot maintain their pace",而选项中的"maintain a fixed time"削弱了题目中的"unable to process the resulting"，我的浅见，还请楼主斟酌哦^_^

necroosu

I think C IS WRONG even it's official answer.

C undermines both theory:

C(1): a beetle usually responds immediately to changes in the insect's direction (undermine the blindness hypo)

C(2): and it pauses equally frequently whether the chase is up or down an incline (undermine the "take a nap" hypo because if the reality were in line with hypo, then the tiger beattle should rest more or less depending on how fast it chases the prey, and C has the opposite, thus making this incorrect)

B undermines only the blindness hypo, and supports the other.

Well, i guess another way to end this ordeal is just to forget this question altogehter and move on...

沧海一粟520

不好意思，换了一个版本

沧海一粟520

C（2）and it pauses equally frequently whether the chase is up or down an incline 不是B的内容吗？

necroosu

汗。。。好吧。。。我看的应该是别的版本，这样说B就被排除了，害我白激动半天。。。

正如刚才说的，B已经排除了。到C：

信息1: 每次停顿时间一致；信息2：停顿后马上提速

这里信息1削弱了“休息”说因为“休息说”规定了休息间隔取决于追击的速度。同时证明了“瞎子”说，因为猎物不断改变路线迫使停顿处理信息

信息2削弱了“休息”说，因为按照“休息说”推理，只要追击速度发生变化，休息时间必定发生变化。

希望这次对题了。。。