Question

16．You've heard of 3D printing from newspaper and TV programs．It can"print"in plastic，metal，nylon，and over a hundred other materials.3D printing technology has been around since the 1980s，it was not widely used until the early 2010s．The first working 3D printer was created in 1984 by Chuck Hull．
3D printers use many different types of technologies，but they all share one thing in common：they create a three-dimensional（维度的） object by building it layer（层），by continuing layer，until the whole object is completed．Imagine a baker lay down each layer one at a time until the whole cake is formed.3D printing is somewhat similar，but just a bit stricter．How can 3D printers work so well？The most important thing-a program，a 3D printer also needs to have instructions for what to print from a computer．It needs a file as well．The file which is a Computer Aided Design （CAD） paper is created with the use of a 3D modeling program．The program creates a paper that is sent to the 3D printer．Along the way，software pieces the design into hundreds，or more likely thousands of layers．The 3D printer builds up one layer at a time，from the bottom to the top，until the object is done．
3D printings can be used for making many kinds of things such as machine parts，daily life objects，even human organs（器官） using a person's own cells．
Nowadays，Marc．Dillon founds a project which deals with many world famous paintings like Leonardo da Vinci's Mona Lisa，Van Gogh's Sunflower with 3D technology．This project helps the blind people enjoy the fantastic art through touching．In order to provide a good user experience，these 3D paintings have special instruments which can tell people what they touch．

49．The first working 3D printer was created inB．
A.1980      
B.1984      
C.2001      
D.2010
50．From Paragraph 2，we can know thatA．
A．how a 3D printer works         
B．what a 3D printing is                     
C．questions of a 3D printer           
D．uses of a 3D printer
51．According to the passage，Dcan help the blind know what they touch．
A．CAD paper                          
B．Machine parts．
C．The world famous paintings        
D．Special instruments 
52．Which of the following is true？C
A.3D printers use 3 types of technologies．
B.3D printers make printings from the top．
C.3D printers work as a baker makes a cake．
D.3D printers piece the design into a few layers．

Answer 1

分析 文章介绍了一种新的高科技--三维印刷技术．它可以"打印"在塑料、金属、尼龙和一百多种其他的材料上．第一个工作三维打印机始于1984年，直到2010年才被广泛地使用．三维印刷可以用来做许多事情，如机器零件，日常生活物品，甚至使用自身细胞的人体器官．有些三维图画通过特殊的仪器让盲人去感知他们所触摸到的东西．

解答 49．B．细节理解题．根据"The first working 3D printer was created in 1984 by Chuck Hull．"可知第一个工作三维打印机始于1984年．故选B．
50．A．细节理解题．根据"3D printers use many different types of technologies，"How can 3D printers work so well？The most important thing-a program，a 3D printer also needs to have instructions for what to print from a computer．"可知此段主要介绍3D打印机是如何工作的．故选A．
51．D．细节理解题．根据"In order to provide a good user experience，these 3D paintings have special instruments which can tell people what they touch．"可知有些三维图画通过特殊的仪器让盲人去感知他们所触摸到的东西．故选D．
52．C．细节判断题．根据"Imagine a baker lay down each layer one at a time until the whole cake is formed.3D printing is somewhat similar，"可知三维印刷与面包师制作蛋糕有点相似之处．故选C．

点评 本题考查科普知识类阅读理解．要想做好科普英语阅读理解题，同学们就要注意平时多读科普知识类文章，学习科普知识，积累常见的科普词汇，从根本上提高科普英语的阅读能力．