ChaseDream

标题: 新开贴请教Tiger beetles那道题 [打印本页]
作者: wofsrt    时间: 2007-4-12 18:30
标题: 新开贴请教Tiger beetles那道题
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]
作者: wofsrt    时间: 2007-4-13 23:48
顶
作者: YY_lalala    时间: 2007-4-14 20:36

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...

作者: wandola    时间: 2007-4-14 21:20

的确是很难。。

谢谢楼上mm的解释。

作者: wofsrt    时间: 2007-4-14 22:36
谢谢lala mm~~~
作者: betty2169    时间: 2008-4-19 14:40

看过,懂了~

前人栽树,后人乘凉^^

作者: cleverkatty    时间: 2010-7-31 20:28
这种题可能是超级高分库里的
作者: giantcb    时间: 2010-7-31 22:44
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。。。。
作者: mandyliang7    时间: 2010-7-31 23:22
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~~~
作者: DMZCedric    时间: 2011-9-5 10:19
今天忽然想不明白这题了。CDer还是很给力的吖。·~
作者: cuican1432    时间: 2011-12-5 23:42
C选项理解：
C strengthens the alternative hypothesis and weakens the idea that they have to pause because they cannot maintain their pace and have to pause to rest.

The reason C weakens the idea that they have to pause to rest is that presumably, they pause because their strengths have given out.  However, C says that they pause at fixed intervals, and if the prey begins to flee, the tiger beetle will increase its speed after the pause.  This suggests that it pauses not because it has to rest to recuperate.  As it pauses at fixed intervals, and yet can expend more energy by running faster, it means that when the beetle paused before the change in speed, it has not become exhausted.  Thus it must have paused for other reasons.

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.
作者: xiaoyanjoy    时间: 2011-12-30 21:33
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...
-- by 会员 YY_lalala (2007/4/14 20:36:00)



可是根据OG12的解释，B选项"in pursing a swerving insect"是支持失明理论，反对休息理论的。
我理解的是：B选项没有提速度问题，只是说insect转向，在视觉信息量增大的情况下（因为转向），beetles停顿次数增多了，说明是由于失明造成的
不知道对不对？期盼高人指点。。。
作者: 邂逅昙    时间: 2012-1-1 22:12
NN给力，开朗了
作者: yangcherry    时间: 2012-3-12 17:55
多谢解释，得救了。
作者: nashlou210    时间: 2012-6-7 18:20
不过，看OG的解释是说，这句话支持了 the second hypothesis,就是你所谓的失明理论啊。 OG, "this statement provides information that strengths the second hypothesis: the swerving pursuit and the resulting continual course adjustments appear to be forcing the beetle to stop with increasing frequency to sort out the erratic visual information".

而不是您说的weaken了失明理论。


求解释！谢谢
作者: nashlou210    时间: 2012-6-7 18:21
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...
-- by 会员 YY_lalala (2007/4/14 20:36:00)



不过，看OG的解释是说，这句话支持了 the second hypothesis,就是你所谓的失明理论啊。 OG, "this statement provides information that strengths the second hypothesis: the swerving pursuit and the resulting continual course adjustments appear to be forcing the beetle to stop with increasing frequency to sort out the erratic visual information".

而不是您说的weaken了失明理论。


求解释！谢谢
作者: cppiod    时间: 2013-4-2 16:51
在gmatclub上看到的解释，觉得还不错，讲得通。仅供参考。

Two hypo: 1) Beetle stopsto take rest
              2) It stops toadjust with changing visual information


A When a prey insect is moved directlytoward a beetle that has been chasing it, the beetle immediately stops and runsaway without its usual intermittent stopping.
Incorrect. I guess you can read this as undermining point 1 because there is nostopping when it runs away, but does it strengthen choice 2? No. This tells usthat if the insect decides to move into an attack position the beetle runsaway. It doesnt mean that they can process changing visuals and it specificallystates that the direction here is straight.

B In pursuing a swerving insect, a beetlealters its course while running and its pauses become more frequent as thechase progresses.
"In pursuing a swerving insect, a beetlealters its course while running undermines (2) andsuggests the beetle CAN see.
"Pauses become more frequent as the chase progresses" strengthens (1) andsuggests the beetle DOES get tired.

C In pursuing a moving insect, a beetleusually responds immediately to changes in the insect's direction, and itpauses equally frequently whether the chase is up or down an incline.
"In pursuing a moving insect , a beetle usually responds immediately tochanges in the insect's direction" undermines (2) andsuggests the beetle CAN see.
"it pauses equally frequently whether the chase is up or down theincline" also undermines (1) andsuggests the beetle does NOT get tired.

D If, when a beetle pauses, it has not gained on the insect it ispursuing, the beetle generally ends its pursuit.
irrelevnet

E The faster a beetle pursues an insectfleeing directly away from it, the more frequently the beetle stops.
Does not undermine any of two hypo
作者: chocolate1992    时间: 2013-7-23 13:26
要是考到这种题就已经进高分库了吧？？
谢谢楼主的解释，第二次错这道题了，第一次错就没搞懂。但现在明白了！！
作者: InfiniteAlex    时间: 2014-9-22 21:47
thanks a lot
作者: InfiniteAlex    时间: 2014-9-22 21:48
thanks a lot



欢迎光临 ChaseDream (https://forum.chasedream.com/) Powered by Discuz! X3.3