OG 11th - DST- 25 - ChaseDream - Powered by Discuz!

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.

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"

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

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。

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.

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。