单项选择题
A．The "Post Paid" Error B．The Two Penny Blue C．A Rare Stamp D．How Mauritius Became Famous
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．an 8-hour workday B．higher wages C．improving working conditions in the factories D．an increase in the employment of small children