OG 11th - DST- 25

ESeraph

Tiger beetles are such fast runners that they can capture virtually 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 a moments 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 prey insects, would support one of the two hypothesis and undermine the other ?

A) When a prey insect is moved directly toward a beetle that has been chasing it, the beetle immediately stops and runs away without its usual intermittent stoppping.

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 wheather the chase is up or down an incline.

D) If, when a beetle pauses,it has not gained on the insect it is pursuing, the beetle generally ends its pursuit.

E) The faster a beetle pursues an insect fleeing directly away from it, the more frequently the beetle stops.

[此贴子已经被作者于2005-9-27 18:21:50编辑过]

BeyondGMAT800

B is the best.

howardwang

C is right.i think

Youknowme

同意选C

Youknowme

以下是引用ESeraph在2005-9-23 11:20:00的发言：
Tiger beetles are such fast runners that they can capture virtually 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 a moments 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 prey insects, would support one of the two hypothesis and undermine the other ? 一个假设是说T.B.不能够保持其速度必须停留做短暂休息然后继续;一个假设是说在跑的过程中,T.B不能够充分地判断迅速变化的现状所以快速停下.

A) When a prey insect is moved directly toward a beetle that has been chasing it, the beetle immediately stops and runs away without its usual intermittent stoppping. 改变题意,成了T.B怕昆虫了,无关.

B) In pursuing a swerving insect, a beetle alters its course while running and its pauses become more frequent as the chase progresses. 红线部分在原文的基础上有意思添加.

C) In pursuing a moving insect, a beetle usually responds immediately to changes in the insect's direction, and it pauses equally frequently wheather the chase is up or down an incline.在追赶的过程中,T.B 通常反应迅速对于昆虫方向的改变,它通常停留以判断继续追赶的方向

D) If, when a beetle pauses,it has not gained on the insect it is pursuing, the beetle generally ends its pursuit. 不符合题意.

E) The faster a beetle pursues an insect fleeing directly away from it, the more frequently the beetle stops. 不能解释题中所说的两种假设的任一种.

请指正.

ESeraph

great catch. i pick C too. But OA is B

The question is from the OG 11th edition. The reasoning in OG given is this.

"This statement provides information that strengthens 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"

howardwang

以下是引用ESeraph在2005-9-23 14:09:00的发言：

great catch. i pick C too. But OA is B

The question is from the OG 11th edition. The reasoning in OG given is this.

"This statement provides information that strengthens 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"

这个词swerving，不认识

，所以，B也没仔细看，觉得不像。

但是，查了字典，觉得B确实支持第二个假设。但是，还是，不太理解，选项B是如何削弱第一个假设的。

og有解释吗？

yuyingchao

我今天做到这一题也选到C ><
以下我打出OG解释

不过OG解释B, 也只提到Strengthen 第二的hypothesis, 没有正面提到如何undermine 第一个, 有谁可以帮忙讲解吗? 谢谢~  

btw, 斑竹可否定一个OG11th的提问格式, 以利提问和搜索

这一题是Diagnostic Test Verbal第25题

Situation

Two hypotheses are offered to explain the sudden stop that tiger beetles make while pursuing their prey: (1) they cannot maintain the rapid pace and must rest, and (2) they run too quickly to process visual information and so temporarily go blind.

Reasoning

What point would strengthen one of the two hypotheses and weaken the other? Consider the information provided in each answer choice, remembering that information that supports one hypothesis must necessarily detract from the other. Any information that is not about pursuit or that affects the two hypotheses equally may be dismissed from consideration. If the frequency of stopping increases when the beetle follows a swerving insect and must constantly change its course, then the second hypothesis is strengthened; the beetle’s pauses increase as the variety of visual information that it needs to deal with increases.

A The hypotheses concern ongoing pursuit; since this information is not about the beetle’s continuing
pursuit of prey, it neither strengthens nor weakens either hypothesis.

B Correct. This statement provides information that strengthens the second hypothesis: the swerving
pursuit of prey and the resulting continual course adjustments appears to be forcing the beetle to stop with increasing frequency to sort the erratic visual information.  

C It this experiment, since neither vision nor tiredness appears to be problematic, the beetle could be
stopping for either reason; this information neither strengthens nor weakens either hypothesis.   

D This information is irrelevant since both the hypotheses are about mid-pursuit behaviors.

E The correlation of frequency of stops with speed affects both hypotheses equally; the pauses could be
equally due to an inability to maintain the pace or due to a need to process the visual information.

ESeraph

yuyingchao, u r right.i change the title.

hope for further explanations.

howardwang

根据og的解释，Any information that is not about pursuit or that affects the two hypotheses equally may be dismissed from consideration. 那么，是不是只要比较片面的强调支持其中的一个假设，就意味着支持另一个假设了呢。（因为原文的两个解释通常某方面必然是对立的，否则就不是两个解释了，而成了一个解释了）

具体到本题，根据In pursuing a swerving insect, a beetle alters its course while running ，确实没有理由支持the beetles cannot maintain their pace and must pause for a moments rest。注意，此处是根据insect's swerving ，a beetle alters its course 而不是its pace and  pause。

至于支持第二个假设，og解释的很清楚。