单项选择题


A．about
B．with
C．into
D．toward
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单项选择题
A．aroundB．aboutC．onD．of
A．around
B．about
C．on
D．of
单项选择题
How many significant demographic changes ever occurred in the past one million years
A．One.
B．Two.
C．Three.
D．Non
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