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

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热门试题

单项选择题

It is necessary to pick up the words when we tell or write in order ______.

A．to show that we are polite
B．to show that we are good at using them
C．to express exactly what we mean
D．to prove that we are not silly

单项选择题

What is TRUE about the words

A．They are used to express feeling only.
B．They can't be written down.
C．They are spoken or written sounds.
D．They are soundless signs.