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 (連續(xù)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(瑣事)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 本文主要給我們講述了3D打印機(jī)的工作原理以及如何使用它.

解答 71.consists   題解題.第三段中"..a(chǎn)n object is created by laying down successive (連續(xù)的 ) layers  of  material until the object is created."這句話告訴我們,3D打印機(jī)打印出來的物體是由多個層次的材料組合而成的.由..組成:consist of
72.work  細(xì)節(jié)題. 閱讀文章第四段到第八段,這部分在講述3D打印機(jī)是如何工作的
 73.step  細(xì)節(jié)題. 第四段中3D printing starts with making a virtual design of…由此可知,making a virtual design of…是3D打印的第一個步驟
74.desired/Wanted/target 細(xì)節(jié)題.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 作定語來修飾object
75.prepared 推理題.第五段中"You will have to prepare a 3D model before it is ready to be 3D printed.."告訴我們,打印前要先準(zhǔn)備3D模型,然后再將其切割.題中概述里用prepared 作定語來修飾3Dmodel,與原意吻合.
76.tool 細(xì)節(jié)題.第五段末說明切片是通過軟件實施的,第六段進(jìn)一步說明有的3D打印機(jī)通過某種切片工具( a certain slicing tool)來進(jìn)行切片.題中的some與文中的certain同意.故用tool單數(shù)形式.
77.fed  細(xì)節(jié)題.由七段"…you are ready to feed it to your 3D printer"轉(zhuǎn)換成被動語態(tài)
78.forme/makes 細(xì)節(jié)題.該題是對第八段的概括.即3D打印機(jī)逐步將許多的層片組成一個完整的物體.由此得出答案
79.size 細(xì)節(jié)題.根據(jù)文中內(nèi)容,consider how big the objects you might want to create 考慮你要創(chuàng)造的物體的大小,即尺寸
80.quality 細(xì)節(jié)題.根據(jù)文中內(nèi)容,As with ordinary printers,print speed also depends on how well it prints.打印速度和你的打印質(zhì)量是密切相關(guān)的

點評 題目涉及多道細(xì)節(jié)理解題,做題時結(jié)合原文和題目有針對性的找出相關(guān)語句進(jìn)行仔細(xì)分析,推理判斷題也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確答案,切忌胡亂猜測,一定要做到有理有據(jù).

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