标题: cr prep答案为什么和og有冲突？？？？ [打印本页] 作者: leeciyuan! 时间: 2014-10-25 18:17 标题: cr prep答案为什么和og有冲突？？？？ prep cr 07#1 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?
AWhen 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. 分析A选项
BIn 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. 分析B选项
CThe 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. 分析C选项
DIf, when a beetle pauses, it has not gained on the insect it is pursuing, the beetle generally ends its pursuit. 分析D选项
EWhen 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. 分析E选项
选C
OG题：
Tiger beetles are such fast runners that they can capture virtually any nonflying 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 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 stops and runs away without its usual intermittent stopping. 分析A选项
BIn pursuing a swerving insect, a beetle alters its course while running and its pauses become more frequent as the chase progresses. 分析B选项
CThe 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. 分析C选项
DIf, when a beetle pauses, it has not gained on the insect it is pursuing, the beetle generally ends its pursuit. 分析D选项
E The faster a beetle pursues an insect fleeing directly away from it, the more frequently the beetle stops. 分析E选项
OG这题选B
为什么同一个选项在同一个题干下面答案不一样？作者: DeliciaAn 时间: 2015-6-24 17:15
up
今天也碰到这个了。木筏理解啊作者: kwyang 时间: 2016-1-31 18:34
我覺得prep比較不好，OG出的比較好：
Prep：
B In pursuing a moving insect, the beetles usually respond immediately to changes in the insect's direction(看得到）, and pause equally frequently whether the chase is up or down an incline（也有力氣）－兩個理論都被否定了
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（有力氣） after its next pause－沒得選了，所以"估計"停下來是因為看不到而非因爲沒力氣，算是支持看不到而停下來的理論，否定沒力氣理論而停下來的理論（正解）
OG：
BIn pursuing a swerving insect, a beetle alters its course while running（看得到） and its pauses become more frequent as the chase progresses（沒力氣）－支持因為沒力氣而停下來，否定因為看不到而停下來（正解）
CThe beetles maintain a fixed time interval between pauses, although when an insect that had been stationary begins to flee, the beetle increases its speed（有力氣）after its next pause－但這次我們不"估計"是不是因為看不到而停下來了，因為B的答案更明確。
但我覺得實戰時根本沒時間想這麼多...