A language is a signaling system which operates with symbolic vocal sounds,

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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(1)_____ in more detail because it is language, more than anything else, (2)_____ distinguishes man from the rest of the (3)_____ world.
Other animals, it is true, communicate with one another by(4)_____ of cries: for example, many birds utter(5)_____ calls at the approach of danger; monkeys utter(6)_____ cries, such as expressions of anger, fear and pleasure.(7)_____ these various means of communication differ in important ways(8)_____ human language. For instance, animals’ cries do not(9)_____ thoughts and feelings clearly. This means, basically, that they lack structure. They lack the kind of structure that(10)_____ us to divide a human utterance into(11)_____.
We can change an utterance by(12)_____ one word in it with(13)______: a good illustration of this is a soldier who can say, e.g., "tanks approaching from the north",(14)_____ 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,(15)_____ means "danger! "
This is why the number of(16)_____ that an animal can make is very limited: the great tit is a case(17)_____ point; it has about twenty different calls,(18)_____ in human language the number of possible utterances is(19)______. It also explains why animal cries are very(20)_____ in meaning. [br] (16)

选项 A、signs
B、gestures
C、signals
D、marks

答案 C

解析文章首句提到，语言是一种信号系统，此处将人的语言与动物的“语言”进行比较．四个选项中，与“语言”相关的只有signal“信号”，故选C。

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A language is a signaling system which operates with symbolic vocal sounds,

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