单项选择题

The real power of words exists in their （）

A．properties
B．characteristics
C．peculiarity
D．representative function

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单项选择题
The origin of language is（）

A．a legend handed down from the past
B．a matter that is hidden or secret
C．a question difficult to answer
D．a problem not yet solved
单项选择题
One of the reasons why men invented certain sounds to express thoughts and actions is that （）

A．they could agree upon certain signs
B．they could write them down
C．they could communicate with each other
D．they could combine them
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