单项选择题

In the 3rd paragraph, "... in the regions where it could be practiced... ", here, "it" refers to______.

A．increase
B．number
C．agriculture
D．species
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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.
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
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