单项选择题

Which one of the following was first discovered or invented in human civilization

A．Agriculture.
B．Language.
C．Fire.
D．Writing.
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单项选择题
The author does not state clearly but implies that in the development of man ______.
A．human speech developed along with other human faculties
B．picture language and written language developed side by side
C．oral language preceded the use of fire
D．the ape might be taught to master speech
单项选择题
Written language in its initial stare was found more advantageous in that ______.
A．it could communicate more accurately than the oral language
B．it had developed from picture language
C．information could be recorded and transmitted
D．it was easier to learn than picture language
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