单项选择题

A．On the walls of caves.
B．On a heavy clay tablet.
C．On woods.
D．On cloth.
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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.
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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