英语四级
Let’s look at this __61__ in more detail because it is language, more than anything else, __62__ distinguishes man from the rest of the __63__ world.
Other animals, it is true, communicate with one another by __64__ of cries: for example, many birds utter __65__ calls at the approach of danger; monkeys utter __66__ cries, such as expressions of anger, fear and pleasure. __67__ these various means of communication differ in important ways __68__ human language. For instance, animals’ cries do not __69__ thoughts and feelings clearly. This means, basically, that they lack structure. They lack the kind of structure that __70__ us to divide a human utterance into __71__.
We can change an utterance by __72__ one word in it with __73__: a good illustration of this is a soldier who can say, e.g., “tanks approaching from the north“, __74__ who can change one word and say aircraft approaching from the north” or “tanks approaching from the west”; but a bird has a single alarm cry, __75__ means “danger!”
This is why the number of __76__ that an animal can make is very limited: the great tit （山雀） is a case __77__ point; it has about twenty different calls, __78__ in human language the number of possible utterances is __79__. It also explains why animal cries are very __80__ in meaning.
A．classification
B．definition
C．function
D．perception
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