[篇章结构]:
段落 关键词 大意推测
第一部分(para.1) Number sense… is the ability to recognize a
1 C (change)
in number. Human beings are born with this ability; …many animals are, too. the bird knows the 5 C
between two and three. 数字感是辨别数字改变的能力。动物和人类一样,与生俱来都具有这样的能力:鸟类可以识别两和三的区别。
第二部分(para.2) experiment showed a bird’s
6 A
number sense. it was not until five men went into the tower and only four left that they were
12 D
able to fool the crow. 一项实验证明,鸟类具有数字感:鸟类对于小的数字有数字感,对于大数字则不太好:五个人时,只有四个人离开时,乌鸦终于被搞糊涂了。
第三部分(para.3) How good is a human’s number sense? ...not very good. But when the number goes beyond three or four…are
14 D. often
fooled.
人类的数字感:同样不是特别好。数字超过三或四时,常会出错。
第四部分(para.4) number sense is something we have in common with many animals...human
15 C. ability
is not much better than a crow’s 结论:数字感是人类和很多动物共同具有的能力,人类的这种能力不比乌鸦更强。
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