云南省楚雄市2017高考英语完形填空、阅读理解一轮基础训练(11)及答案
【广东卷完形填空】
Number
sense is
not
the
ability
to
count. It is the ability to recognize a
1
in
number. Human beings are born with this ability.
2
,experiments show that many animals are, too. For example, many birds have good number sense. If a nest has four eggs and you remove one, the bird will not
3
. However, if you remove two, the bird
4
leaves. This means that the bird knows the
5
between two and three.
Another interesting experiment showed a bird's
6
number sense. A man was trying to take a photo of a crow(乌鸦)that had a nest in a tower, but the crow always left when she saw him coming. The bird did not
7
until the man left the tower. The man had an
8
.He took another man with him to the tower. One man left and the other stayed, but they did not
9
the bird. The crow stayed away until the second man left, too. The experiment was
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2017-04-24
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