ChaseDream

标题: 可以帮忙解释一下，答案是C [打印本页]

作者: 斯巴达 时间: 2010-5-6 13:38
标题: 可以帮忙解释一下，答案是C
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.

erhaps 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? （有点像评估题）

(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.

作者: crystalhuang 时间: 2010-5-6 20:50
我的理解是这样的，要区别两个解释，要知道他们有什么不同
第一个：stop是因为TB不能控制自己的步伐
第二个：stop是因为TB跑到一定速度时会看不清周围的环境
c说TB在奔跑时以固定时间停下来，即使它在加速追赶猎物的时候也保持一样时间的停顿，那么TB的停顿则与速度无关，也就是说它不是因为跑的太快达到一定速度（看不清楚）才停下来的，而是跑一顿时间因为体力等等原因它不能控制自己的步伐，所以要停下来

欢迎光临 ChaseDream (https://forum.chasedream.com/)