[填空题] A language is a signaling system which operates with symbolic vocal sounds (语声), and which is used by a group of people for the purpose of communication. 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
A. A．about
B．with
C．from
D．in

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