单项选择题

A．Two hours.
B．Four hours.
C．Six hours.
D．Eight hours.
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单项选择题
A．Written by children themselves.B．Personalized story books for children.C．Printed with standard things.D．Published with thc help of computers.
A．Written by children themselves.
B．Personalized story books for children.
C．Printed with standard things.
D．Published with thc help of computers.
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