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Number sense is not the ability to count. It is the ability to recognize a __16__ in number. Human b...
Number sense is not the ability to count. It is the ability to recognize a __16__ in number. Human beings are born with this ability. __17__, 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 __18__. However, if you remove two, the bird __19__ leaves. This means that the bird knows the __20__ between two and three.
Another interesting experiment showed a bird's __21__ number sense. A man was trying to take a photo of a crow that had a nest in a tower, but the crow always left when she saw him coming. The bird did not _22__ until the man left the tower. The man had an __23__. He took another man with him to the tower. One man left and the other stayed, but they did not __24__ the bird. The crow stayed away until the second man left, too. The experiment was __25__ with three men and then with four men. But the crow did not return to the nest until all the men were __26__. It was not until five men went into the tower and only four left that they were __27__ able to fool the crow.
How good is a human's number sense? It's not very good. For example, babies about fourteen months old almost always notice if something is taken away from a __28_ group. But when the number goes beyond three or four, the children are __29__ fooled.
It seems that number sense is something we have in common with many animals in this world, and that our human __30__ is not much better than a crow's.
空白处选择
Another interesting experiment showed a bird's __21__ number sense. A man was trying to take a photo of a crow that had a nest in a tower, but the crow always left when she saw him coming. The bird did not _22__ until the man left the tower. The man had an __23__. He took another man with him to the tower. One man left and the other stayed, but they did not __24__ the bird. The crow stayed away until the second man left, too. The experiment was __25__ with three men and then with four men. But the crow did not return to the nest until all the men were __26__. It was not until five men went into the tower and only four left that they were __27__ able to fool the crow.
How good is a human's number sense? It's not very good. For example, babies about fourteen months old almost always notice if something is taken away from a __28_ group. But when the number goes beyond three or four, the children are __29__ fooled.
It seems that number sense is something we have in common with many animals in this world, and that our human __30__ is not much better than a crow's.
空白处选择
参考答案: C
参考解析: 考查上下文语境。根据上文的语义提示可知，这里的ability与首段的ability形成相同词的复现关系。文章末段与首段开甩语义照应上的前后照应的关系。四个选项的含义分别为：A“视力，看见”，B“本质，天性，内在”，C“能力”，D“信仰，相信”。本段为结论段，根据语境，本句句义为：好像数字感是我们与世界上的许多动物都具备的能力，而且我们人类的这种能力不比乌鸦更强。故选C。
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