Question

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The first United States airmail stamp has an interesting story. Printed in 1918, this 24-cent stamp with a blue plane inside rose border became the center of much attention. One hundred of the stamps sold to the public became known as "inverts", for the plane was printed upside down. Singles of these "upside down" airmail stamps are now worth over $ 100,000.The story of these stamps began on May 14, 1918, the day after they were placed on sale. In Washington D. C., W. T. Robey, a man interested in stamps, decided to buy a sheet of the new stamps and so went to the New York Avenue branch post office in Washington. When the clerk handed him a sheet of the stamps, Robey noted that they were poorly centered. He looked at other sheets and found that none was well centered. The clerk asked Robey to return later in the day when more stamps were expected.About noon Robey came back, and the same clerk was on duty. He reached for the new sheets and handed one to Robey. The collector's heart stood still as he saw that the sheet which had been offered him had inverted centers.
Excited by his find, Robey shopped other branch post offices for more sheets with inverted centers but found none. Then be told his friend of his discovery, and they, too, looked in the city's post offices - also in vain.Not being a rich man, Robey decided to cash in on his good fortune. He turned down the first offer of $ 500 from a Washington stamp shop owner and took the sheet to New York. There he planned to show it to a collector, Colonel E. H. R. Green, as well as to stamp dealers.Colonel Green was out of the city, and no one else wanted to bid on the sheet for fear that Robey's might not be the only upside down sheet. As the news of his great find spread, many people said that other such sheets had been found. These stories proved to be false.Robey left New York without having made a sale, and stopped in Philadelphia on the way home. There, dealer Eugene Klein arranged to buy the sheet for $ 15,000 and finally did buy it. Within a few days, Klein sold the sheet to Colonel Green, the same collector whom Robey had failed to contact in New York. There is a tale that the Colonel was in Texas at the time, and that Klein phoned him there and sold him the sheet, sight unseen, for $ 20,000! Robey's sheet had cost him $ 24, and his profit was $ 14,976 while Klein gained $ 5,000.Of the 100 stamps first bought by Mr. Robey, stamp collectors are now able to account for 96. What has happened to the others is not known. When a copy is offered for sale it is a major event in the stamp world. A block of four stamps has been sold for sale it is a major event in the stamp world. A block of four stamps has been sold for as much as $ 500,000. Few people have ever seen a copy. Yet no matter how much this valuable stamp is bought and sold, no owner can match the thrill that W. T. Robey had on that day in 1918 when he made America's luckiest stamp find!
47. This article is about ____.
A. the first-class stamps eighty years ago
B. revenue stamps in the United States
C. the first United States airmail stamps
D. special delivery stamps
48. These stamps were valuable because ____.
A. the centers of them were "upside down"
B. they were the wrong color
C. they were off center
D. there were so few of them
49. When Robey told his friends of the find, they ____.
A. tried to buy his stamps
B. also went to look for such stamps
C. reported Robey to the government
D. none of the above
50. The dealers knew that if there were other sheets like Robey's then ____.
A. Robey must be lying
B. there were no perfect ones
C. the stamps were no good
D. Robey's stamps would be worthless
51. Robey's stamps have seen by ____.
A. many people
B. no one
C. few people
D. everyone

Answer 1

CABDC

自己做的、不一定全对哈