新开贴请教Tiger beetles那道题

wofsrt · 发表于 2007-4-12 18:30:00

Tiger beetles are such fast runners that they can capture virtualy any nonflying insect. However, when running toward an insect, a tiger beetle will intermittently stop and then, a moment later, resume its attack. Perhaps the beetles cannot maintain their pace and must pause for moment's rest; but an alternative hypothesis is that while running, tiger beetles are unable to adequately 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 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 immidiately stops and runs away without its usual intermittent stopping.
B. In pursuing a swerving insect, a beetle alters its course while running and its pauses become more frequent as the chase progresses.
C. In pursuing a moving insect, a beetle usually responds immediately to changes in the insect's direction, and it pauses equally frequently whether the chase is up or down an incline.
D. If, when a beele pauses, it has not gained on the insect it is pursuing, the beetle generally ends its pursuit.
E. The faster a beetle pursues and insect fleeing directly away from it, the more frequently the beetle stops.

这是OG上的，但是我居然没找到，汗一记。答案是B，偶实在不理解，请NN指教它是如何支持一个削弱另一个的！另外这个是哪版OG的？

[attachimg]57406[/attachimg]

这是PREP上出现的过的版本，选项变了，答案是C，偶还是理解不了，再次请教它是如何支持一个削弱另一个的！

[此贴子已经被作者于2007-4-12 18:34:51编辑过]

wofsrt · 发表于 2007-4-13 23:48:00

YY_lalala · 发表于 2007-4-14 20:36:00

这个题很难

原题在OG 11th 黄本P34，Diagnostic Test第25题，以前版上讨论过

关键是要支持一个，同时要排除另外一种解释的可能性

OG题：B前一部分：in pursing a swerving insect, a beetle alters its course while running - swering是突然转向，偏离轨道的意思。也就是说猎物一转方向，beetle就马上反应。所以失明理论就不成立（因为按照失明理论，beetle应该会反应不过来）。后一部分：its pauses become more frequent as the chase progresses. 追得越久停的次数越多，就是累了么，好理解，所以支持了休息理论。

Prep变形题：
B: the beetles usually respond immediately to changes in the insect's direction 同上理，否定掉了失明理论。但是后面一部分：pause equally frequently不能支持休息理论（更像是否定了休息理论）。个人觉得如果是往上追比往下追停得频繁就支持了休息理论。所以B不对

C：fixed time interval否定休息理论; 猎物从静态开始飞，beetles要停会才反应过来加速追，支持了失明理论

个人觉得这个C选项很难选，我应该也是做错了的。而且这种题考场上碰到一定很耗时间，还不一定对，sigh...

wandola · 发表于 2007-4-14 21:20:00

的确是很难。。

谢谢楼上mm的解释。

wofsrt · 发表于 2007-4-14 22:36:00

谢谢lala mm~~~

betty2169 · 发表于 2008-4-19 14:40:00

看过,懂了~

前人栽树,后人乘凉^^

cleverkatty · 发表于 2010-7-31 20:28:41

这种题可能是超级高分库里的

giantcb · 发表于 2010-7-31 22:44:10

好难，看了题目都没有方向。。。
不过LALAMM的解释还是很清楚的。学习了。。。。

mandyliang7 · 发表于 2010-7-31 23:22:16

哇！太好了，刚巧做了这题做错了...还没想清楚呢....
这就有解释了~ 谢谢lalala~~~

DMZCedric · 发表于 2011-9-5 10:19:42

今天忽然想不明白这题了。CDer还是很给力的吖。·~

新开贴请教Tiger beetles那道题

新开贴请教Tiger beetles那道题

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