19.How do people traditionally manufacture (制造) things?They usually start with a sheet of metal,wood or other material and cut,drill (鉆) 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 (探測器),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 (噴灑) 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 (樹脂) 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 (盜版)."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 本文為說明文,文章介紹了3-D打印機的信息,并客觀進行評價.

解答 53---55 ADB
53.答案A.推理判斷題.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講了3-D打印機可以打印出基本上你可以想出的東西.由此可以推斷出3-D打印機可以改變人們制造產(chǎn)品的方式.故A正確.由文章第四段倒數(shù)第二句but until recently they hadn't been very popular since few people could afford them.可知很少人能夠支付的起3-D打印機.故B錯誤.C、D文章均沒有提及.故選A.
54.答案D.細節(jié)理解題.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打印機的價格下降很多.D選項意為3-D打印機是很多人能夠支付的起的,符合語境.故選D.
55.答案B.觀點態(tài)度題.本文作者客觀的談及了3-D打印機的好處和壞處.objective,客觀的. 故選B.

點評 科普類文章一般由標題(Head line),導語(Introduction),背景(Back ground),主體(Main body)和結尾(End)五部分構成.標題是文章中心思想高度而又精辟的概括,但根據(jù)歷年的高考情況來看,這類閱讀理解材料一般不給標題,而要同學們選擇標題.導語一般位于整篇文章的首段.背景交待一個事實的起因.主體則對導語概括的事實進行詳細敘述,這一部分命題往往最多,因此,閱讀時,同學們要把這部分作為重點.結尾往往也是中心思想的概括,并與導語相呼應,命題者常在此要設計一道推理判斷題.在進行推理判斷時,同學們一定要以閱讀材料所提供的科學事實為依據(jù),同時所得出的結論還應符合基本的科普常識.

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