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Tiger beetles are such fast runners that they can capture virtually any non?ying 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 arti?cially 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 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 ?eeing directly away from it, the more frequently the
beetle stops.
题中给出两个假设：1，累了要休息，2，不能及时捕捉changing visual info所以短暂失明。
答案是B。OG的解释说是strenthen了第二个假设。也没说削弱了第一个啊！而且，没有明白为什么B中说pause more frequent了，这代表了什么？
我选的是C。然后pauses equally frequently不管up or down证明他不是因为体力不支要休息而是因为blind了.但是好像也没有驳倒第一个。。
请大家具体说明一下怎么就support一个undermine另一个了= =感激涕零！！ |
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发表于 2012-8-3 17:44:37
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