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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.
(C)休息之间的时间是固定的，尽管当一只静止不动的猎物准备逃跑时，beetle在下一次休息后会加快速度。每次飞的时间固定，但是会加速，否定了体力论（若支持体力论，速度快时飞的时间应该短），支持了视力论。beetle体力没有问题，可还是要pause，其目的就是要定位，看准了方向再加速
(E)sometimes什么也说明不了
那去掉sometimes是不是就可以作为支持视力论的论据了呢登录 或 注册 后可以参加讨论
https://www.manhattanprep.com/gmat/forums/tiger-beetles-are-such-fast-runners-cr-t3238.html
这里面的选项答案不太一样登录 或 注册 后可以参加讨论
②一定要注意一些极端修饰
fact：bettle去追insect的时候会有间歇的stop
（注意：读的时候一定要把转这类的词在心里加粗加黑！！alternative hypothesis）
解释①不能维持pace，必须要短暂的休息（补充体力）
解释②不能够很快的处理眼前的信息，追的过程中突然blind，所以要stop
题目要求：哪一种结果会support一个解释然后undermine另一个
C选项：有fixed时间间隔，说明不论飞的快慢，休息的时间都一样（默认如果解释①对的话，应该是飞的快的时候休息时间长）；一个最开始静止的虫子突然逃走了，beetle休息之后进行了加速，说明它在pause的时候确实用眼睛处理了信息
B选项：注意看到B选项的后半段就可以为C提供一些思路，但是B错就错在认为beetle处理信息是immediately的
on the other hand, this evidence seems to support the "fatigue" hypothesis, because ... this is just how fatigue works, in general. the longer a creature runs, the more breaks it needs... so, supports #1, basically undermines #2.”
visual论说是速度太快瞎了才不得不停，这和休息后的增加了的速度是矛盾的，因为速度太快会瞎啊，我要是beetle我肯定不为了瞎而再加速，因此否定visual论。
C中maintain a fixed time interval between pauses要么是因为体力要么是因为视力，然后说停顿后会加速，那明显是否定体力不知，所以只剩下视力
(A)当猎物面对beetle飞来时，beetle马上跑走，没有边飞边停。与题目条件不符
(B) 追猎物时，beetle根据猎物的位置变化马上转变（否定视力论），并且无论猎物上坡还是下坡都以一样的频率休息（否定体力论，假若支持累要休息，上坡休息应该更频繁）。此选项2个原因都否定了
(C)休息之间的时间是固定的，尽管当一只静止不动的猎物准备逃跑时，beetle在下一次休息后会加快速度。每次飞的时间固定，但是会加速，否定了体力论（若支持体力论，速度快时飞的时间应该短）。支持了视力论，beetle体力没有问题，可还是要pause，其目的就是要定位，看准了方向再加速
(D)如果当beetle休息时，它还没有赶上它追的猎物，beetle就会结束追赶。无关项
(E)当追赶过程中beetle前面有阻碍物时，beetle有时会立马停止，但是他们不会围障碍物转。无关项
这道题的关键是需要找到一个实验，满足在支持某假设的时候还能够同时削弱另一个假设。
C rest (wrong); blind(right)