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.

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