事故调查组由有关人民政府、安全生产监督管理部门、负有安全生产监督管理职责的有关部门、

How can a small stamp be worth ＄16,800?

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 (前英国殖民地) of M auritius (毛里求斯岛), a small island in the Indian Ocean. In 1847 an 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 (总司令) 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 ＄16,800 for one of them.

小题1:When a mistake is made in the printing of the stamp, the stamp___________.

A．will be thrown away

B．increases in value

C．is not worth buying

D．is worth no more than its face value小题2:Why did Mauritius print some stamps too? Because__________.

A．London stamps were not well printed

B．London would not print them

C．invitations to a big dance had to be posted quickly

D．Mauritius had a very good printer小题3:“Post Paid” means___________.

A．the same as “Post Office”

B．the Post Office is the place to buy stamps

C．money has been paid for the stamp

D．the letter must be posted

对革兰阳性菌及抗药金黄色葡萄球菌作用强，对革兰阴性菌作用较差是（）头孢菌素的特点

A、第一代

B、第二代

C、第三代

D、第四代

抗震等级为二级的框架结构，一般情况下柱的轴压比限值为（）

A.0.7

B.0.8

C.0.75

D.0.85

螺旋缝焊接钢管试验压力最大压力不得超过20.7MPa，并且保持压力不少于（）

A.5s

B.10s

C.30min

D.60min

圈梁是沿外墙、内纵墙和主要横墙在同一水平面设置的连续封闭梁，所以圈梁如果被门窗洞口或其他洞口截断，应在洞口上部设置附加梁。（）