Any mistake made in the printing of a stamp raises its value to stamp collectors．A mistake on a two-penny stamp has made it worth a million and a half times its face value．

Do you think it impossible？Well，it is true．And this is how it happened．

The mistake was made more than a hundred years ago in the former British colony（殖民地）of Mauritius，a small island in the Indian Ocean．In l847all order for stamps was sent to London Mauritius was about to become the fourth country in the world to put out stamps．

Before the order was filled and the stamps arrived from England，a big dance was planned by the commander-in-chief of all the armed forces on the island．The dance would be held in his house and letters of invitation would be sent to all the important people in Mauritius．Stamps were badly needed to post the letters．Therefore，an islander，who was a good printer，was told to copy the pattern of the stamps．He carelessly put the words"Post Office"instead of"Post Paid"，two words seen on stamps at that time，on the several hundred that he printed．

Today，there are only twenty-six of these misprinted stamps left-fourteen One-penny Reds and twelve Two-penny Blues，Because there are so few Two-penny Blues and because of their age，collectors have paid as much as﹩16，800for one of them．

55．Mauritius is the name of___

A． a Pacific island B．a province of India

C．a stamp D．a former colony of Great Britain

56．When was the mistake in printing made？___

A．Not long ago．

B．In the eighteenth century．

C．In the nineteenth century．

D．After some stamps arrived from London．

57．In l847most countries of the world were___

A．not yet using stamps

B．printing stamps in Mauritius

C．printing their own stamps

D．collecting valuable stamps

58．Mauritius printed some stamps too because___

A．London stamps were n