A language is a signaling system which operates with symbolic vocal sounds, and which is used by a group of people for the purpo

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问题      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.
【C12】

选项 A、replacing
B、spelling
C、pronouncing
D、saying

答案A

解析 根据作者接下来所举的两个例子,我们可以推断出作者这里要表达“用一词来替另一词”之意,例如:The new city,Brasilia,replaced Rio de Janeiro as the capital of Brazil in l960.巴西利亚这座新城市于1960年取代了里约热内卢成了巴西的首都。
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