题目内容
7．A few years ago，I studied in Salem．I had just met （61）afriend who lived in Boston．Sometimes on weekends，I would take the train to see him and then（62）usually（usual） take the last train back at night．One Saturday evening．I took the last train back to Salem．I was tired，so I fell asleep in spite of the fact that（63）itwas a less than 30-minue ride．About an hour after I boarded the train，a man woke me up and said，"I heard you order a ticket to Salem before we got（64）on．so I just let you know this is the stop for Gloucester．I'm sorry I didn't wake you up（65）earlier（early） because I fell asleep too．"Hearing that，I was（66）frightened（frighten）．My phone was dead and I（67）spent（spend） my last bit of cash on the train ticket．
I went to the conductor to tell her had fallen asleep（68）andthat I didn't have money．With theirs（69）running（run） down my face．She then handed me 40andsaid，"IwillcallyouataxiwhenwegettoGloucester．"I asked how I could repay her and she asked me（70）to give （give）$40 to my favorite charity．I would never forget that．
分析 作者在本文中讲述了一次坐车时由于睡着了而错过下车的经历．
解答 61．a；考查冠词，此处用不定冠词a泛指"一个"．
62．usually；考查副词，此处用副词形式usually，在句中作状语．
63．it；考查代词，这里指代的是路程，要用代词it．
64．on；考查介词，get on是固定短语，意为"上车"．
65．earlier；考查比较级，分析句意为"我没能早一点叫醒你，因为我也睡着了"，故用比较级形式earlier．
66．frightened；考查分词作形容词，修饰主语I，要用过去分词形式作形容词．
67．spent；考查动词的时态，此处讲述过去发生的事情，故用一般过去式．
68．and；考查固定句型，此处用that构成强调句型"it is/was+被强调部分+that从句"．
69．running；考查with复合结构，theirs与动词run是主谓关系，故用现在分词形式构成复合结构，表示主动．
70．to give；考查动词不定式，ask sb to do sth 是固定搭配，意为"要求某人干某事"．
点评 首先要通读全文，了解大意，抓住上下文语境所提供的信息，明确空格所要填的词义，词型和短语搭配，给出所要填的正确形式，然后整体阅读，核对答案．
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Title：A liegiliners'Gmk to 3D Printing．
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．
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