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precondition
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单项选择题
A．Its eyes.B．Its face.C．Its wings.D．Its tail.
A．Its eyes.
B．Its face.
C．Its wings.
D．Its tail.
单项选择题
A．About one month.B．About two months.C．About two and a half months.D．About three months.
A．About one month.
B．About two months.
C．About two and a half months.
D．About three months.
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