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2.We see the world in three dimensions.Now,we can print in three dimensionst,too,thanks to a manufacturing process:3D priming.
3D printing or additive manufacturing is a process of making three dimensional solid objects from a digital file.
The creation of a 3D printed object is achieved using additive piocesses.In an additive process an object is created by laying down successive (连续的 ) layers  of  material until the object is created.Each of these layers can be seen as a thinly sliced horizon till (水平的)cross-section of the eventual object.Today's 3D printers are being used to print everything from design models to jewelry,crafts,product   parts,body parts,and even food.
3D printing starts with making a virtual design of the object you want to create.This virtual design is for instance a CAD (Computer Aided Design) file.This CAD file is created using a 3D modeling application or with a 3D scanner (to copy an existing object).A 3D scanner can make a 3D digital copy of m object.
You will have to prepare a 3D model before it is ready to be 3D printed.This is what they call slicing.Slicing is dividing a 3D model  into  hundreds or thousands of horizontal  layers  and needs to be done with software.
Sometimes a 3D model can be sliced from within a 3D  modeling software  application.It is also possible that you are forced to use a certain slicing tool for a certain 3D printer,
When the 3D model is sliced,you are ready to feed it to your 3D printer.This can be done via USB.SD or WiFi.It really depends on what brand and type 3D printer you have.
When a file is uploaded in a 3D printer.the object is ready to be 3D printed layer by layer.I'he 3D printer reads every slice(2D image) and creates a three dimensional object.
Before you pick up a 3D printer and experimenting in the 3D world,consider how big the objects you might want to create,If your goal is to print foot-long rulers,you'll fall short of that goal if the printer you choose can only handle objects smaller 6inches  in height and width.
Another reality check is print speed.,You'll be able to knock out a days worth of chores(琐事)while the primer is running,with a typical 4-inch model requiring as many as 12 hours to print.As with ordinary printers,print speed also depends on how well it prints.
Title:A liegiliners'Gmk to 3D Printing.
What is 3D printing?3D printing is a process of making three-dimens ion objects out of a digital file.
An object created with 3D printing (71)consistsof a number of layers of material.
How does 3D printing (72)work?The first (73)stepis  to make a virtual design of your (74)desire\wanted\targetobject.
A(75)prepared3D model is slictxl into a hujzc number of layers with software or some (76)toolfor a certain 3D printer.
  The sliced model is (77)fedto a 3D printer
The 3D printer (78)forme\makesthe layers into an entire object step by step.
What else do you need to know?The (79)sizeof what you intend to make is a factor in your choice of a 3D printer,
Prim speed is associated with print (80)quality.

分析 本文主要给我们讲述了3D打印机的工作原理以及如何使用它.

解答 71.consists   题解题.第三段中"..an object is created by laying down successive (连续的 ) layers  of  material until the object is created."这句话告诉我们,3D打印机打印出来的物体是由多个层次的材料组合而成的.由..组成:consist of
72.work  细节题. 阅读文章第四段到第八段,这部分在讲述3D打印机是如何工作的
 73.step  细节题. 第四段中3D printing starts with making a virtual design of…由此可知,making a virtual design of…是3D打印的第一个步骤
74.desired/Wanted/target 细节题.第四段中‘…the object you want to create.'即…所想要打印的物件,因此可以用wanted desired 或者target 作定语来修饰object
75.prepared 推理题.第五段中"You will have to prepare a 3D model before it is ready to be 3D printed.."告诉我们,打印前要先准备3D模型,然后再将其切割.题中概述里用prepared 作定语来修饰3Dmodel,与原意吻合.
76.tool 细节题.第五段末说明切片是通过软件实施的,第六段进一步说明有的3D打印机通过某种切片工具( a certain slicing tool)来进行切片.题中的some与文中的certain同意.故用tool单数形式.
77.fed  细节题.由七段"…you are ready to feed it to your 3D printer"转换成被动语态
78.forme/makes 细节题.该题是对第八段的概括.即3D打印机逐步将许多的层片组成一个完整的物体.由此得出答案
79.size 细节题.根据文中内容,consider how big the objects you might want to create 考虑你要创造的物体的大小,即尺寸
80.quality 细节题.根据文中内容,As with ordinary printers,print speed also depends on how well it prints.打印速度和你的打印质量是密切相关的

点评 题目涉及多道细节理解题,做题时结合原文和题目有针对性的找出相关语句进行仔细分析,推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案,切忌胡乱猜测,一定要做到有理有据.

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