单项选择题

A postage stamp's value to collectors is raised if（）

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

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单项选择题
According to the passage, the Knights of Labor wanted all of the following EXCEPT （）

A．an 8-hour workday
B．higher wages
C．improving working conditions in the factories
D．an increase in the employment of small children
单项选择题
You can infer that most of the goals of the Knights of Labor were（）

A．unwelcome by the AF of L
B．not reached until after the Knights of Labor died out
C．not helpful to women
D．welcome by factory owner
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