OG诊断题19关于那个该死的beetle

2017

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 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 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 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 progress.
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 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。
正确答案B

OG的解释：
Situation： Two hypotheses are off ered 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 aff ects 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.

B Correct. 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.

我的想法：B正确，但理解和OG解释完全相反……我认为  a beetle alters its course while running说明beetle不需要停下来调整vision再改变course，weaken关于visual的说法； and its pauses become more frequent as the chase progress说明after chasing and running around for a while, it got tired so needed more frequent pauses to catch up its breath.

大家怎么想的？这个问题缠绕我好几天了，我的思路无法调整和出题人一致，请大家看到我的想法的flaw后不吝赐教告诉我哈

2017

为什么没人回答啊 ，有人知道吗？

yuepingintamu

我跟你想得一样。

2017

我跟你想得一样。

-- by 会员 yuepingintamu (2011/3/23 7:02:22)

谢谢回复！我实在不知道怎样转变脑筋

yuepingintamu

有个变体是没有这里的B选项多了一个下面的选项：

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 the next pause.

答案是这个选项。

yychole

对于这道题，我现在还是没有清晰的思路……

2017

有个变体是没有这里的B选项多了一个下面的选项：

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 the next pause.

答案是这个选项。

-- by 会员 yuepingintamu (2011/3/23 7:19:07)

这个选项这样理解：每隔一段固定时间后停下来，说明不是因为运动所致，而是需要处理一段时间内的一定量的视觉信息；第二句话更加证明不是运动所致，因为假如是，那么加速后应该pause越来越频繁

sunskywind

终于找到了一个和我想法相似的。看了好几个帖子。在**上有个版主都乱解释。Anyways，这样B选项就完全可能是因为体力。而OG解释是因为要处理视觉信息。既然2个都解释的通，那么这个选项是不是就不能选了呢。

sunskywind

btw.是新的13版OG的测试25题了。

ciciwenwen

http://www.beatthegmat.com/tiger-beetles-t33608.html
GMATGuruNY 的思路是和楼主的一样。B是对的，但是OG的解释相反：（
其实我也是这样想的。