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(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.
(17)
选项 A、in
B、at
C、of
D、for
答案A
解析 a case in point为固定搭配，意为“有意义的例证”。因此应选A。
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