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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?

正确答案: C

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楼主
发表于 2011-5-6 10:51:49 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
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.
我选择的答案是a~~~看了很多帖子也没觉得a为什么不对~~谁可以帮帮我啊~~

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沙发
发表于 2011-5-6 15:04:54 | 只看该作者
原文:
B抓不飞的昆虫。但是,中间总是停顿,一个解释是需要休息;另一个解释是视力原因。
问,削弱一个,加强一个

选项:
A、目标移向B,B转身逃走,中间不停顿。
B、追昆虫,B对昆虫的转向响应快,常常停留。重复原文的现象,不能回答问题无关。
C、两次停顿之间的时间固定,尽管提升速度在下次停顿前(当虫子飞走了)。讲的是速度。原文没有。
D、B停留,找不到目标就停了。不能回答问题
E、有障碍,虫子停了一下,但是继续绕着障碍转。不能回答问题。

综上,A比较合适。
板凳
 楼主| 发表于 2011-5-6 15:37:52 | 只看该作者
可是。。。答案是c貌似~~
地板
发表于 2011-5-20 14:56:12 | 只看该作者
误以为是OG25,晕
5#
发表于 2011-5-20 15:24:06 | 只看该作者
楼上说乱套了。
6#
发表于 2011-5-21 20:03:21 | 只看该作者
尝试解释下,求拍砖:

A:猎物飞向追它的b时,b马上转向飞走,还不带停顿的。
b有没有被昆虫的绝地大反击吓走,是心理素质问题,与体力和视觉都没关系。
但没有停留似乎是排除体力的因素,因为如果是体力问题,那为什么追别人的时候体力不足,逃跑的时候体力倒挺足的呢?
先留着

B:在追移动的昆虫的情况下,b经常对昆虫的方向变化反应很快,不管路线是斜向上还是斜向下,停顿频率一样
对体力和视觉的影响都一样,停顿有可能是看不见,也有可能是体力不足。
排除

C: b每次停顿时间间隔相同,即使昆虫从静止开始飞,唯一区别是b下次间隔后提速。
也就是说,b看见昆虫飞了,也是提速追上去,只是由于体力限制,不得不休息,它心里也急啊....不是看不见,只是体力不行。因此排除视觉原因,肯定是体力的问题。
A和C相比,C更直接一些,GMAT答案是没有绝对的对错,只是相对而言哪个更好。


D:如果当b停顿时没有逮到,就不追了
不追有可能是看不见了,也有可能是太累了。
无法判断哪个因素导致b的半途而废。
排除

E:当b前突然出现障碍,b有时候马上停下,但从不绕着障碍转圈。
绕圈不绕圈是智商问题,与体力和视觉没关系。
这个选项似乎与视觉有点关系,但能看见障碍不代表能看到远处移动的昆虫。
排除。
7#
发表于 2011-9-5 22:57:13 | 只看该作者
两观点:1是 TB暂停攻击是要恢复体力;2是 TB暂停攻击是要恢复视力。

选项需要一褒一贬。

B说,TB能对猎物运动转向做出迅速反应(贬2),且无论往斜坡上行还是下行都休息同样的频率(贬1)。
C说,即使静止的猎物开始准备逃走了,TB数次停歇间的运动时间仍是固定的,(褒2),然后在下一次停歇后加速追击(贬1)。

所以此题C正确
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