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.
(1)视力不行体力行
(2)体力不行视力行
错选B,B中同时削弱了两个说法(至少没有加强其中一个)。只有C是加强了rest(equal pause),削弱了视觉(看见了prey逃走后加速)。
题眼:虫子累了歇着还是不适应看各种方向要歇着。b转向不停加强2同样频率歇着加强1.看清楚问题是加强一个,c是加强累着,ade无关
这是在support体力不支的选项而undermine看不见的那个选项。因为:1已经看到猎物飞走了还要每隔一段时间休息一下不是很蠢 么,只可能是飞不动了,2如果已经看不见了后来又要加速追赶不是更加看不见了么。。。理解2:这是在support视力不好的解释而undermine体力不支的解释,因为后面说道加速,但是前面有说每隔一段固定时间休息一下,如果是加速飞行的话体力不支的更厉害,应该缩短休息时间,而现在这样的做法(每隔一段固定时间休息一下,只是因为每隔一段时间就要定位一下,看一下周围的情况,同时,在上次停顿后看清后可以飞的更快。
不是很清楚为什么答案是C。求老师讲解,谢谢!
DE首先排除。A没有削弱h1,B对h1和h2均加强,C削弱h1加强h2
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○A 削弱原因一、二。” immediately turns” 不存在视力问题,削弱原因二;"runs away without its usual intermittent stopping”不存在体力与视力问题,削弱原因一、二。
○B 只削弱原因二。”respond immediately to changes in the insect's direction” 不存在视力问题,削弱原因二;”pause equally frequently” 重复题干,不排除有第三种原因的可能,对原因一、二不构成逻辑推理关系。
○C 只加强原因一。”increases its speed after its next pause” 存在体力问题,加强原因一;对原因二不构成逻辑推理关系。
○D 对原因一、二不构成逻辑推理关系。
○E 只加强原因二。”never respond by running around the barrier” 若视力好,则会绕过障碍,存在视力问题,加强原因二;对原因一不构成逻辑推理关系。
C的时候甲虫的内心戏是这样的:饲料跑了!不行我缓缓,太累了。。。追!
也就是说他能在跑的时候看见,但是他每次“缓一缓”的时间是一样的意味着他是因为累所以不能追上
你这个内心戏是真的皮 哈哈哈哈
哈哈 ,透彻
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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
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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