单项选择题
A．how cruel the king was B．how clever the minister was C．Sissa was a famous mathematician D．how the game of chess came into being
A．there are few others like it B．there are no errors on the stamps C．a mistake is made in the ,printing D．both A and C
A．not yet using postage stamps B．collecting valuable stamps C．buying stamps from Neuritis D．printing their own stamps