答jing82h PREP第24题-虎甲抓昆虫

11已有 631 次阅读  2011-04-14 16:50

24.   

 老师,这道题,是说下面的选项支持一个假设,驳斥另一个假设。那么我开始选的E,这个选项错的原因是: 遇到障碍物后,停下来,说明beetles是能迅速反应的,但也没支持需要休息的另外个假设??? C是对的,是否可以理解为:beetles飞行的interval是固定的,说明beetles是需要休息-支持第一个假设,beetle应昆虫的变化而随即改变了速度-说明驳斥了另外一个假设。??

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.


我的解答:

题型:支持/削弱

假设1.当beetles跑向一只昆虫时,它需要间歇性停止,过一会后继续攻击。
假设2.跑动当中的tiger beetles不能够处理突然的视觉信息变化,很快变瞎并停了下来。

A. 当一个被捕食的昆虫直接向正在追它的beetle移动时,bettle很快转身并在毫无间隙停顿下跑远了。 
无关选项。
B. 为了追赶移动的昆虫,beetles通常转向迅猛,同时不管上坡还是下坡,都可以保持间歇性停顿。
这句话同时支持了假设1和假设2
C.当一个昆虫准备逃走时,beetle在它下一次停顿前很快增加速度。但是beetle在每次停顿之间需要保持休息。
第一句话削弱了假设2.第一句话支持了假设1,Bingo!
D. 如果beetle没有抓到追捕的昆虫停下来了,它通常会放弃追捕。
无关选项
E. 当有障碍物突然出现在跑动中的beetle面前,它有时会突然停下来。但是在障碍物附近跑动时它们没有反应。
支持假设2,但没有削弱条件1。


本题译文

Tiger Beetles(虎甲)跑的非常快以至于几乎可以抓住任何不会飞的昆虫。然后,当beetles跑向一只昆虫时,它需要间歇性停止,过一会后继续攻击。也许它们不能够维持它们的步法并且需要停下来歇会。但是另一种假设指出跑动当中的tiger beetles不能够很快处理视觉信息的变化,很快变瞎并停了下来。

如果使用了人工可移动的捕食昆虫进行试验发现,下面哪个描述可以支持其中的一个假设并削弱了另一个?

A. 当一个被捕食的昆虫直接向正在追它的beetle移动时,bettle很快转身并在毫无间隙停顿下跑远了。 

B. 为了追赶移动的昆虫,beetles通常转向迅猛,同时不管上坡还是下坡,都可以保持间歇性停顿。

C.当一个昆虫准备逃走时,beetle在它下一次停顿前很快增加速度。但是beetle在每次停顿之间需要保持休息。

D. 如果beetle没有抓到追捕的昆虫停下来了,它通常会放弃追捕。

E. 当有障碍物突然出现在跑动中的beetle面前,它有时会突然停下来。但是在障碍物附近跑动时它们没有反应。



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  • stream 2011-04-14 16:57
    谢谢分享!
  • Summer 2011-04-14 19:35
    牛啊,透彻啊!耐心啊!!!好老师!!!
  • s 2011-04-15 11:31
    Summer: 牛啊,透彻啊!耐心啊!!!好老师!!!
    同意,哇哈哈
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