单项选择题

A．A pen.
B．A school bag.
C．A book.
D．A pencil.
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单项选择题
A．Bone structure.B．Smell ability.C．Birth mode.D．Recover ability against diseas
A．Bone structure.
B．Smell ability.
C．Birth mode.
D．Recover ability against diseas
单项选择题
A．Soil.B．Human population.C．Forest.D．Water.
A．Soil.
B．Human population.
C．Forest.
D．Water.
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