A language is a signaling system which operates with symbolic vocal sounds, and which is used by a group of people for the purpose of communication.
Let's look at this【C1】______ in mom detail because it is language, more than anything else,【C2】______ distinguishes man from the rest of the【C3】______ world.
Other animals, it is true, communicate with one another by【C4】______ of cries: for example, many birds utter【C5】______ calls at the approach of danger; monkeys utter【C6】______ cries, such as expressions of anger, fear and pleasure.【C7】______ these various means of communication differ in important ways【C8】______ human language. For instance, animals' cries do not【C9】______ thoughts and feelings dearly. This means basically that they lack structure. They lack the kind of structure that【C10】______ us to divide a human utterance into【C11】______ We can change an utterance 【C12】______ one word in it with 【C13】______ a good illustration of this is a soldier who can say, e.g., "tanks approaching from the north",【C14】______ 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,【C15】 ______ means "danger!"
This is why the number of【C16】______ that an animal can make is very limited: the great tit is a case【C17】______ point; it has about twenty different calls,【C18】______ in human language the number of possible utterances is【C19】______ It also explains why animal cries are very【C20】______ in meaning.
【C1】

A. classification
B. definition
C. function
D. perception