单项选择题

In 1847 most countries of the world were （）

A．not yet using postage stamps
B．collecting valuable stamps
C．buying stamps from Mauritius
D．printing their own stamps

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单项选择题
$16，800 is the collector’s value of （）

A．the One-penny Orange-red
B．a correctly printed 1847 stamp
C．the Two-penny Blue
D．both A and C
单项选择题
The mistake on the locally printed stamps was in the （）

A．spelling
B．wording
C．price
D．colour
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