单项选择题

A．Half a year.
B．Half a circle.
C．A bicycle.
D．Quarter of a circle.
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单项选择题
A．Sun clock.B．Hemicycle.C．Obelisk.D．Shadow clock.
A．Sun clock.
B．Hemicycle.
C．Obelisk.
D．Shadow clock.
单项选择题
A．50%.B．20%.C．30%.D．All of it.
A．50%.
B．20%.
C．30%.
D．All of it.
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