单项选择题

A．November.
B．December.
C．June.
D．March.
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单项选择题
A．They eat protein.B．They never move from one location.C．They cause erosion of rocks.D．They will never be useful to people.
A．They eat protein.
B．They never move from one location.
C．They cause erosion of rocks.
D．They will never be useful to people.
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