See a cell phone cover that you like on Taobao? Forget about placing an order, paying the

See a cell phone cover that you like on Taobao? Forget about placing an order, paying the bill online and waiting for days for it to be delivered to you. In the near future, you'll be able to get it in minutes just by hitting print on your computer.
You might find it hard to believe that you could actually print an object like you would a picture. But it is not that hard to understand how it would work. Just as a traditional printer sprays (喷) ink onto paper line by line, modern 3-D printers spread material onto a surface layer by layer, from the bottom to the top, gradually building up a shape.
Instead of ink, the materials the 3-D printer uses are mainly plastic, resin (树脂)and certain metals. The thinner each layer is --- from a millimeter to less than the width of a hair --- the smoother and finer the object will be.
This may sound like a completely new technology, but the truth is that 3-D printing has been around since the late 1980s. Back then, it was hardly affordable for most people, so few knew about it.
Last year, though, saw a big change in the 3-D printing industry--- printers became much cheaper. For example, 10 years ago a desktop 3-D printer might have cost £20,000 (200,000 yuan), while now they cost only about £ 1,000, according to the BBC.
Taken out of the factory and introduced to more diverse and common uses, 3-D printing can create just about anything you can think of ---flutes (笛子), bikinis, jewelry, aircraft parts and even human organs. In fact, scientists from Cornell University in New York have just made an artificial ear using a 3-D printer, according to Science Daily. The fake ear looks and acts exactly like a natural one.
However, as 3-D printing becomes more common, it may bring about certain problems --- such as piracy(盗版). Once you can download a coffee maker, or print out a new set of kitchen utensils (餐具) on your personal 3-D printer, who will visit a retail (零售的) store again? an expert in 3-D printing told Forbes News. Even more frightening, what if anyone in the world could use a 3-D printer to print out a fully functioning gun?
【小题1】According to the article, in the future, the 3-D printing technology will .A．enable people to make better purchases onlineB．be applied as widely in our daily lives as computersC．change the way we make many productsD．shorten the time it takes for people to get what they buy online【小题2】What was the big event happening in the 3-D printing industry last year?A．The 3-D printing technology was taken out ofthe factory.B．The 3-D printer became more affordable forconsumers.C．The 3-D printer was used for medical treatmentfor the first time.D．3-D printing technology began to be used invarious fields.【小题3】How is the last paragraph developed?A．By analyzing a cause and an effect.B．By making comparisons.C．By giving examples.D．By presenting research findings.【小题4】What is the best title of the passage?A．Printing out everythingB．Technology in the futureC．Online shopping disappearingD．Great demand for 3-D printersC

(答案→)C 解析：本文介绍了三维印刷机的情况，它通常被简称为3D印刷机，其工作原理非常简单。首先在电脑上绘制产品草图，并细化修补其形状和着色。接着按下印刷按钮，印刷机开始运作，产品慢慢成型。3D印刷术将随着技术本身的不断改进迅速铺开，使用成本急剧下降。但是本文还给出了一些担忧，万一能够印出枪支了，不就对社会的治安带来一些麻烦了。【小题1】细节理解题。根据In the near future, you'll be able to get it in minutes just by hitting print on your computer.改变了我们制造产品的方式,故选C【小题2】细节理解题。根据Last year, though, saw a big change in the 3-D printing industry--- printers became much cheaper. For example, 10 years ago a desktop 3-D printer might have cost £20,000 (200,000 yuan), while now they cost only about £ 1,000, according to the BBC.人们能够买得起了,因为价格降下来了,故选B。【小题3】细节理解题。根据it may bring about certain problems举例说明它的普遍性,故选C。【小题4】标题归纳题。根据全文来看3D印刷机能接触到的领域很广，故选A。

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