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  3. 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 p

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 p

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问题     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【C1】______in more 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 clearly. 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 by【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(山雀)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 不管填的是哪个选项，空格与后面的“means danger”都是一个完整的句子，空格中的词作这个句子的主语，而它的前面也是一个完整的句子，而且用的是逗号，由此可以判断后面的句子应该是个非限制性定语从句。
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