单项选择题

A．In the early 1900’’s.
B．In the mid-1800’’s.
C．In the early 1800’’s.
D．In the late 1800V
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单项选择题
Why is it that memory has been vital in the evolution of humanity
A．Because our ancestors needed memory to explain their activity.
B．Because our ancestors needed memory to remember how to do things.
C．Because there were always disagreements among our ancestors.
D．Because our ancestors needed to create something.
填空题
ocean
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