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题库 / Prep2007E1-CR-24
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?
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.
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.
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.
If, when a beetle pauses, it has not gained on the insect it is pursuing, the beetle generally ends its pursuit.
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.
A，既能看到又能改变pace，削弱两个推测
B，既能马上变化方向，又在不同倾斜度保持同一pace，削弱两个推测
C，停歇间隔不变，速度可以调整，加强了视力推测，削弱了体力推测
D，暂停时没追到就放弃了。与推测内容无关。
E，有时对障碍物有反应，但从不绕着障碍物飞。削弱视力推测，没有提到体力推测。
求讲解。
前辈基础上稍稍补充并细化下一点猜测
A，既能看到 (削弱视觉推测)，又能在不停歇的情况下马上跑开（削弱体力推测）。同时削弱两个推测。
B，对昆虫的方位变化迅速反应（削弱视觉推测），在不同倾斜度保持是pause时间相等（对体力推测只是细化了，既没有加强也没削弱）。
C，同样的时间间隔后才休息（加强了体力推测），及时虫子由静到动，也在下一个休息后才加速（对insects的变化有加速反应，削弱了视觉推理，这其实自己觉得有些牵强）
D，暂停时没追到就放弃了。与推测内容无关。
E，有时对障碍物有反应，但从不绕着障碍物飞。削弱视力推测，没有提到体力推测。
同求讲解。
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