单项选择题

A．50 cents.
B．60 cents.
C．80 cents.
D．1 dollar.
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单项选择题
A．Both research and chores.B．Only to feed the birds.C．Only to clean cages.D．To dissect (解剖) pigeons.
A．Both research and chores.
B．Only to feed the birds.
C．Only to clean cages.
D．To dissect (解剖) pigeons.
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