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

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.
【C15】
选项 A、this
B、that
C、which
D、it
答案C
解析 这里which引导的是非限制性定语从句，例如：In human life there is nothing，which prospers to the end．在人类生活中，没有什么事是永远繁荣的。
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