首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
What’ s the main topic of this passage?
What’ s the main topic of this passage?
admin
2019-10-21
59
问题
What’ s the main topic of this passage?
Before a new plane goes into service, every part of it is tested again and again. But there are two tests that are more important than all the others. In , the first test, a modern airliner must fly at very high altitudes. Air must be pushed into the airliner so that the passengers can breathe. The metal structure of the plane has to be very strong for this reason. When the airliner is filled with air, the air presses against the skin of the plane inside. The pressure on a small window, for instance, is like a huge, giant foot that is trying to get out. If a small part of the plane were to crack, the plane would explode in the sky. It is lowered into a huge tank of water to test the structrue of the plane. Then it is filled with air. The pressure inside the plane is greater than it ever will be when it is in the air. Finally, there is an explosion. Engineers can discover which part of the plane has cracked.
In the second test, the test pilot must find out exactly what happens when all the engines are shut off at once. He takes the plane up very high. Then he shuts the engines off, the plane begins to fall like a stone. It is the pilot’s job to find out how he can control the plane again. These two tests are examples of how planes are made safe before they ever carry passengers.
选项
A、The plane would not go forward.
B、The plane would explode.
C、The plane would fall down.
D、The plane would fly slowly.
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/EGCd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
Aestheticsisbroaderinscopethanthephilosophyofart,whichcomprisesoneofitsbranches,Itdealsnotonlywiththenatur
Menlietowomen.Attheheartofmanymen’slies,however,isthemaleego.Menlietobuildthem-selvesuportoconcealsome
Forthispart,youareallowed35minutestowriteacompositionbasedonthefollowinggraphwhichshowsthechangeinExpenses
Thespeakersmentionedthefollowingexcept_______.
Broadlyspeaking,theEnglishmanisaquiet,shy,reservedpersonwhoisfully【21】______onlyamongpeopleheknowswell.
Consideringnaturalresources,whatshouldAmericansdoaccordingtothepassage?
Itdoesn’ttakeanEinsteintorecognizethatAlbertEinstein’sbrainwasverydifferentfromyoursandmineThegraymatterhou
Forcenturies,explorershaveriskedtheirlivesventuringintotheunknownforreasonsthatweretovaryingdegreeseconomican
Aspartofmorecomprehensivecomplianceandethicsprograms,manycompanieshaveformulatedinternalpoliciespertainingtothe
Readthefollowingtext(s)andwriteanessayto1)summarizethemainpointsofthetext(s),2)makeclearyourownv
随机试题
简述帕累托最优状态和帕累托增进的关系。
女,58岁。2型糖尿病15年,长期口服格列本脲,10mg/d。查体:血压145/90mmHg,心、肺和腹部检查未见异常,双下肢无水肿。眼底检查:视网膜病变Ⅲ期。空腹血糖6.8mmol/L,餐后2小时血糖10.6mmoL/L,血尿素氮6.2mmol/L,血肌
A.升麻B.麦芽C.桃仁D.麻黄E.黄芪有无证候禁忌是处方审核的一项重要内容。医生为患有高血压、不寐、多汗的病人开具了包含上述中药的处方,执业药师在审核时应告知医生。体虚多汗者忌用()。
关于公务员的辞职和辞退,下列哪些说法是正确的?
(2012年、2010年)两台水泵工况相似的条件是其叶轮符合()条件。
单位要组织工作成果宣传展示。要邀请上级领导和媒体,你会做哪些准备工作?
材料2004年8月22日,胡锦涛在邓小平同志诞辰一百周年纪念大会上的讲话中指出:“在邓小平同志指导下,1978年12月召开的党的十一届三中全会,重新确立了解放思想、实事求是的思想路线,确定把党和国家的工作重点转移到社会主义现代化建设上来,作出实行改革开放
关于结构化程序设计原则和方法的描述错误的是()。
Amongtheraftofbooks,articles,jokes,romanticcomedies,self-helpguidesandotherwritingsdiscussingmarriage,somefamil
Anestimated20percentoftheU.S.populationhasnobankaccount.Morethanhalfofthisgroupdon’thavecreditcard______ca
最新回复
(
0
)