Number sense is not the ability to count

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问题 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A.appointmentB.excuseC.ideaD.explanation

选项 A.appointment
B.excuse
C.idea
D.explanation

答案 C

解析考查上下文语境。根据上下文可知：这个人第一种方法行不通，所以这里再用另一方法，由此运用逻辑推断可知，这里要表达的意思是：这个人有（或想出）了一个主意，四个选项的含义分别为：A“失望”，B“借口”， C“主意，想法”，D“解释”。根据语境，下文讲了他的具体做法。A、B和D都不符合，故选C。

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