单项选择题

It is the author's view that in human civilization agriculture______.

A．is the most important step man has ever made
B．is only less important than the discovery of fire
C．had long been practiced since 3000 B. C.
D．can be ranked in importance with the invention of machines
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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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