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The thinner each layer is-from a millimetre to less than the width of a hair-the smootherand finer the object will be.This may sound like a completely new technology,but thetruth is that 3D printing has been around since the late 1980s.Back then,it was barelyaffordable for most people,so few knew about it.Last year,though,saw a big change inthe 3D printing industry-printers became much cheaper.For example,10 years ago adesktop 3D printer might have cost f20,000,while now they cost only about f 1,000,according to the BBC.Taken out of the factory and introduced to more diverse and common uses,3Dprinting can create just about anything you can think of flutes,bikinis,jewelry,aircraftparts and even human organs.In fact,scientists from Cornell University in New York havejust made an artificial ear using a 3D printer,according to Science Daily.The fake earlooks and acts exactly like a natural one.However,as 3D printing becomes more common,it may bring about certainproblems-such as piracy."Once you can download a coffee maker,or print out a new setof kitchen utensils on your personal 3D printer,who will visit a retail store again?"anexpert in 3D printing told Forbes News.Even more frightening,what if anyone in theworld could use a 3D printer to print out a fully functioning gun?47.According to the article,in the future,the 3D printing technology willA.enable people to make better purchases onlineB.change the way we make many productsC.be applied as widely in our daily life as computersD.shorten the time it takes for people to get what they buy online48.What happened in the 3D printing industry last year?A.The 3D printing technology was taken out of the factory.B.The 3D printing technology began to be used in various fields.C.The 3D printer was used for medical treatment for the first time.D.The 3D printer became more affordable for consumers.49.How is the last paragraph developed?A.By giving examples.B.By making comparisons.C.By analyzing the cause and effect.D.By presenting research findings高一英语试题第9页（共12页）