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OG12上的自测25
Tiger beetles are such fast runners that they can capture virtually any nonflying insects. However, when running toward an insect, a tiger bettle will intermittently stop and then, a moment later, resume its attack. Perhaps cannot maintain their pace and must pause for a moment's rest; but an alternative hypothesis is that while running, tiger bettles 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 artigicially moved prey insects, would support one of the two hypotheses and undermine the other?
A When a prey insect is moved directly toward a bettle that has been chasing it, the bettle immediately stops and runs away without its intermittent stopping.
B In pursuing a swerving insect, a bettle alters its course while running and its pauses become more frequent as the chase progress.
C In pursuing a moving insect, a bettle 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 bettle pauses, it has not gained on the insect it is pursuing, the bettle generally ends its pursuit.
E The faster a bettle pursues an insect fleeting directly away from it, the more frequently the bettle stops.
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发表于 2010-10-17 10:55:27
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