单项选择题

Which is true about words

A．They are used to express thoughts only.
B．They can be spoken, but can not be written down.
C．They are simply sounds.
D．They are not completely known to the world.

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热门试题

单项选择题

______ men invented certain sounds to express thoughts and actions.

A．Because they wanted to agree on certain signs
B．As they needed to write them down
C．Since they wanted to communicate with each other
D．Now that they could combine them

单项选择题

A．necessaryB．unnecessaryC．necessitousD．necessity

A．necessary
B．unnecessary
C．necessitous
D．necessity