单项选择题

A．One to three million years ago.
B．Two to three million years ago.
C．One to three billion years ago.
D．Two to three billion years ago.
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单项选择题
A．On the walls of caves.B．On a heavy clay tablet.C．On woods.D．On cloth.
A．On the walls of caves.
B．On a heavy clay tablet.
C．On woods.
D．On cloth.
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