推 heyuwhatsup:因為上下坡都沒有改變暫停頻間隔,代表beetle並非無法 01/11 22:10
→ heyuwhatsup:維持步伐 01/11 22:10
→ tecoteco:原來是跟上下坡有關係 考得好細啊... 01/12 06:52
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?
(A) 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.
(B) 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.
(C) 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.
(D) If, when a beetle pauses, it has not gained on the insect it is pursuing,
the beetle generally ends its pursuit.
(E) 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.
答案是 (C)
但我覺得 (B) 也可以是答案
解答上說(B)選項只說明 beetles 沒有失明 並沒有說 beetles 需要休息
但(B)的後半部說 beetles 會
"pause equally frequently whether the chase is up or down an incline"
每隔一段時間都會停頓不就表示它需要休息嗎?
已經找了很多地方都看不到這點的討論
希望版上的大家幫幫忙
謝謝!!
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 61.223.62.53