2. 外语
  3. Many animal and even plant species communicate with each other. Humans are not unique in this capability. Therefore, human【S1】__

Many animal and even plant species communicate with each other. Humans are not unique in this capability. Therefore, human【S1】__

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问题     Many animal and even plant species communicate with each
other. Humans are not unique in this capability. Therefore, human【S1】______
language is unique in being a symbol communication system that is【S2】______
learned instead of biologically inherited.
    A word is one and more sounds that in combination with a
special meaning assigned by a language. The symbolic meaning of【S3】______
words can be so powerful that people are willing to risk their lives
for them or take the lives of others.
    A major advantage of human language is being a learned【S4】______
symbolic communication system is that it is infinitely flexible.
Meanings can be changed and new symbols create. This is【S5】______
evidenced by the fact which new words are invented daily and the【S6】______
meaning of old ones changes. Languages evolve in response to
change historical and social conditions. Some language【S7】______
transformations typically occur in a generation or more. For
instance, the slang words used by your parents were very different
from it that you use today. You also probably are familiar with many【S8】______
technical terms, such as " text messaging" and " high definition
TV" , which were not in general use even a decade ago.
    Language and speech are not the same thing. Speech is a
broad term simply referred to patterned verbal behavior. In contrast,【S9】______
a language is a set of rules for generating speech. A dialect is a
variant of a language. If associated with a geographically isolated
speech community, it is referred to a regional dialect. However, if【S10】______
it is spoken by a speech community that is merely socially isolated,
it is called a social dialect which is mostly based on class, gender,
age, and particular social situations.
【S4】
选项
答案is—去掉is
解析 be动词冗余。此句主干为A major advantage of human language is that…，being a learned symbolic communication system为非谓语动词结构作后置定语，修饰human language，故应把being前面的is去掉。句意为“人类语言作为一种符号化的沟通系统，其最大的优势在于它的无限灵活性。”
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