单项选择题

One of the reasons why men invented certain sounds to express thoughts and actions was that they could ______.

A．agree with certain signs
B．write them down
C．make themselves understand each other
D．combine them
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单项选择题
The origin of language is ______.
A．clearly explained in this passage
B．a matter that can not be or has not been explained or understood
C．a question that was difficult to answer
D．a problem already solved
单项选择题
A great writer is one who ______.
A．has great thoughts
B．is good at deeply impressing us with the power of correct words
C．is careful in choosing correct words
D．both A and B
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