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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