单项选择题

Which of the following periods saw people develop a more communal form of living

A．Paleolithic
B．Ice Age
C．Mesolithic
D．Neolithic
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单项选择题
Which period lasted longest
A．Paleolithic
B．Ice Age
C．Mesolithic
D．Neolithic
单项选择题
What is the best alternative of the word address in the first paragraph
A．Speak.
B．Write.
C．Explanation.
D．Talk.
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