求助PREP1-24!

louis_huang

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.

答案是C,但为什么B不对? 我是这样理解的: 在抓捕动着的昆虫的过程中,虎蜂对昆虫变相反应及时,削弱原因2;抓铺是否要朝还是朝下的时候,停止,加强原因1.

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.

答案是C,但为什么B不对? 我是这样理解的: 在抓捕动着的昆虫的过程中,虎蜂对昆虫变相反应及时,削弱原因2;抓铺是否要朝还是朝下的时候,停止,加强原因1.

banboshuying

这题争论很多。

Tiger beetle 中文也叫： 虎甲虫

http://baike.baidu.com/view/95363.htm

瞬间失明，也就是结论2是出题人希望支持的结论。

redable

請問誰可以幫幫忙翻一下選項E嗎?

thanks!

尾巴儿

答案C：就算猎物要逃跑了，甲虫还是会停--有可能加强2，因为可能是因为看不见了
停顿后，甲虫会跑的更快来追猎物---削弱1，根据1，甲虫停顿是因为无法保持速度而停下来休息，那么既然它还能加速，那就不是速度的缘故停顿

louis_huang

24题答案如何理解？

louis_huang

谢谢！我明白了，那么C项应该怎么理解？the beetle increases its speed after its next pause可以认为是加强原因1，那么削弱原因2怎么理解呢?

芷萱85

B的后半句：pause equally frequently whether the chase is up or down an incline.

上坡下坡休息时间均等。一般来讲上坡更费体力就应该休息更久，但是上下坡时间一样就说明是体力外的原因，说明体力好啊，是削弱原因1，不是加强1。这句话的重点在equally，不在pause。