[求助]prep1-24

crystalgan

24.   (29155-!-item-!-188;#058&003857)

 

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.

答案为C

请问选项A为什么不对呢？

bigapple1234

这个只能证明第一个假设是错的,对第2个假设起不到削弱或者加强的作用

lynn_ql

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小伊YSY

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

欢迎拍砖