文档介绍：2013 年普通高等学校招生全国统一考试( 广东卷) I 语言知识及应用(共两节,满分 45 分) 第一节完形填空(共 15 小题;每小题 2 分,满分 30 分) 阅读下面短文,掌握其大意,然后从 1~15 各题所给的 A、B、C和D 项中,选出最佳选项,并在答题卡上将该项涂黑。 The number sense is not the ability to count, but 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. Ifa 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 ofa crow ( 乌鸦) that has a nest ina tower, but the crow always left when she saw ing. 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 ____ 10 ____ with three men, and then four men. But the crow did not return to the nest until all the men were ____ 11 ____. It was not until five men went into the tower and only four left that they were ____ 12 ____ able to fool the crow. How good his the human ’s number sense? It’s not very good. For example, babies about fourteen months old