Have you ever had dreams about building a robot? Or putting together a spaceship? Or even seeing your face made out of chocolate? Done. All you need is a 3-D printer!
The possibilities of 3-D printing seem endless. All the user has to do is to design(设计) an object on the computer and choose a material(材料) to print in. The printers print in hundreds of different materials including glass, sugar and even skin! When the user presses “print”, the 3-D printer spreads the material layer(层) by layer and like magic the object is produced.
The first 3-D printer was invented in 1986 by an American, Charles Hull. But 3-D printing has only become cheap enough recently for most people to use. Designers now use 3-D printing to create unusual things. The Dutch artist Dirk Vander Kooj prints furniture made from old fridges. And doctors have used 3-D printing to print human body parts! The Telegraph reported in February that scientists from Cornell Medical College even printed a man-made ear.
But like a lot of new technologies, if 3-D printing gets into the wrong hands, it can be dangerous. In 2011 a group of four men in the US used 3-D printing to produce ATM skimmers (提款机盗刷器). These were placed on an ATM and stole over $400,000 from users of the ATM. It is terrible to think that criminals like them might one day use a 3-D printer to print a gun.
But for better or for worse, 3-D printing has been put into use. In a few years, you’ll probably be wondering how you could ever live without your 3-D printer!

_______ invented the first 3-D printer.

A．Charles Hull	B．Dirk Vander Kooj
C．A doctor called Cornell	D．Four men in the U.S

What is the correct order for people to use a 3-D printer?
a. Choose a proper material.
b. Press the print button.
c. The 3-D printer spreads the material.
d. Use a computer to design an object.

A．a-b-c-d	B．d-a-b-c
C．a-c-d-b	D．d-c-b-a

The underlined word “criminals” in the fourth paragraph might mean ______________ in Chinese.

A．技术员

B．军人

C．罪犯

D．用户

According to the passage, people have NOT yet produced _________ with a 3-D printer.

A．some furniture	B．a man-made ear
C．ATM skimmers	D．a gun

What does the writer think of the 3-D printer?

A．It is necessary only for our work.

B．It is helpful but dangerous.

C．It is too expensive for most people.

D．It is useless in our daily life.