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19.How do people traditionally manufacture (制造) things?They usually start with a sheet of metal,wood or other material and cut,drill (钻) and shave it to create a desired shape.Sometimes,they use a mold (模具) made of metal or sand,pour liquid plastic or metal into it and let it cool to create a solid part.
Now,a completely different method is gaining popularity.
On Oct.9,2013,London Science Museum kicked off its new exhbition,3-D:Printing the Future,with over 600 3-D printed objects on display,including space probes (探测器),toy dolls and even human organs-basically any product you can think of,reported Live Science.
You ight find it hard to believe that an object can actually be"printed out"like a picture.But it is not that hard to understand how it works.Just as a traditional printer sprays (喷洒) in 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.And objects always come out in one piece,sparing you the trouble of putting different parts together afterward.
For example,10years ago a desktop 3-D printer might have cost£20,000 (200,000yuan),while now it costs only about£1,000,according to the BBC.In fact,3-D printers have been around for some time,but until recently they hadn't been very popular since few people could afford them.Last year,though,saw a big decrease in the price of 3-D printers.
However,as 3-D printing technology becomes more commonplace,it may trigger certain problems.One of them is 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 on 3-D printing told Forbes News.
Even more frightening,the world's first 3-D printed gun was successfully fired in the US in May of this year,which means that 3-D printing could potentially give more people access to weapons.

53.According to the article,in the future,3-D printing technology will probablyA.
A.change the way people make products
B.be applied as widely in our daily lives as computers
C.forbid many countries to make purchases of weapons
D.take the place of normal printers and save lots of energy
54.What was the big event that happened in the 3-D printing industry last year?D
A.Over 600 3-D printed objects were on display in an exhibition.
B.3-D printing technology came to be used in various fields.
C.The world's first 3-D printed gun was successfully made.
D.The 3-D printer became more affordable for consumers.
55.What is the author's attitude toward 3-D printing technology?B
A.Amused.
B.Objective.
C.Supportive.
D.Negative.

分析 本文为说明文,文章介绍了3-D打印机的信息,并客观进行评价.

解答 53---55 ADB
53.答案A.推理判断题.文章第一段最后一句Sometimes,they use a mold (模具) made of metal or sand,pour liquid plastic or metal into it and let it cool to create a solid part讲了3-D打印机可以打印出基本上你可以想出的东西.由此可以推断出3-D打印机可以改变人们制造产品的方式.故A正确.由文章第四段倒数第二句but until recently they hadn't been very popular since few people could afford them.可知很少人能够支付的起3-D打印机.故B错误.C、D文章均没有提及.故选A.
54.答案D.细节理解题.由文章第四段最后一句Last year,though,saw a big decrease in the price of 3-D printers.可知,去年3-D打印机的价格下降很多.D选项意为3-D打印机是很多人能够支付的起的,符合语境.故选D.
55.答案B.观点态度题.本文作者客观的谈及了3-D打印机的好处和坏处.objective,客观的. 故选B.

点评 科普类文章一般由标题(Head line),导语(Introduction),背景(Back ground),主体(Main body)和结尾(End)五部分构成.标题是文章中心思想高度而又精辟的概括,但根据历年的高考情况来看,这类阅读理解材料一般不给标题,而要同学们选择标题.导语一般位于整篇文章的首段.背景交待一个事实的起因.主体则对导语概括的事实进行详细叙述,这一部分命题往往最多,因此,阅读时,同学们要把这部分作为重点.结尾往往也是中心思想的概括,并与导语相呼应,命题者常在此要设计一道推理判断题.在进行推理判断时,同学们一定要以阅读材料所提供的科学事实为依据,同时所得出的结论还应符合基本的科普常识.

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