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 users have to do is to design an object on the computer and choose a material 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 U. S. used 3-D printing to produce ATM skimmer（提款机盗刷器）. These were placed on an ATM and stole over $ 400, 000 from user 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!
【小题1】_________ invented the first 3-D printer.| A．Charles Hull | B．Dirk Vander Koj |
| C．A doctor called Cornell | D．Four men in the U.S |
| A．技术员 | B．军人 | C．罪犯 | D．教练 |
| A．some furniture | B．a man-made ear | C．ATM skimmers | D．a gun |
| 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. |
