单项选择题

A．By digging site.
B．By reconstructing skeletons.
C．By observing them closely.
D．By living with them.
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单项选择题
A．Mary herself.B．Her professor.C．Her parents.D．Her friends.
A．Mary herself.
B．Her professor.
C．Her parents.
D．Her friends.
单项选择题
A．It was stolen.B．It was given a ticket.C．She couldn’’t find it.D．She found it towed away by the police.
A．It was stolen.
B．It was given a ticket.
C．She couldn’’t find it.
D．She found it towed away by the police.
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