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Tiger beetles are such fast runners that they can capture virtually any nonflying insect. However, when running toward an insect, a tiger beetle will intermittently stop and then, a moment later, resume its attack. Perhaps the beetles 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 adequately process the resulting rapidly changing visual information and so quickly go blind and stop.
Which of the following, if discovered in experiments using artificially move d 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 stops and runs away without its usual
intermittent stopping.
(B) In pursuing a swerving insect, a beetle alters its course while running and its pauses become more frequent as the chase progresses.
(C) In pursuing a moving insect, a beetle usually responds immediately to changes in the insect’s direction, and it pauses equally frequently whether the chase is up or down an incline.
(D) If, when a beetle pauses, it has not gained on the insect it is pursuing, the beetle generally ends its pursuit.
(E) The faster a beetle pursues an insect fleeing directly away from it, the more frequently the beetle stops.
正确答案是B选项。我做题时选的是E。在看了OG的解析后，感觉还是不太懂。
关于B选项主要是阅读理解上有障碍，while running的意思是指在追逐的过程中边跑边改变方向，还是虫子停下来转向也算在while running里呢？
关于E选项，我做题时的理解是因为prey是directly直线逃跑，所以不需要确定方向，因此跑得越快停得越多是为了休息。看到答案后意识到虫子可能不确定prey会不会一直走直线，所以要停下来确认，但如果是这样的话，不管prey是直线走，还是像B选项扭着走，虫子都没法预测路径，那么prey的逃跑方式对虫子的停歇次数应该没有影响才对。不知道我是哪里的思路错了/(ㄒoㄒ)/~~求大神们解释！谢谢~~~ |
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发表于 2017-8-15 23:13:44
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