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

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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
单项选择题
What is true about words（）

A．They are used to express feelings only.
B．They can not be written down.
C．They are simply sounds.
D．They are mysterious.
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