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
2016-06-25
48
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、To find out exactly what happens.
B、To save fuel.
C、To fly more slowly.
D、To keep balance.
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/2WRd777K
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
CollegesportsintheUnitedStatesareahugedeal.AlmostallmajorAmericanuniversitieshavefootball,baseball,basketball
Mostpeoplewhotravellongdistancescomplainofjetlag(飞行时差综合症).Jetlagmakesbusinesstravelerslessproductiveandmorepro
Mostpeoplewhotravellongdistancescomplainofjetlag(飞行时差综合症).Jetlagmakesbusinesstravelerslessproductiveandmorepro
Weallknowthatscienceplaysanimportantroleinthesocietiesinwhichwelive.Manypeoplebelieve,however,thatourprogr
Biologically,thereisonlyonequalitywhichdistinguishesusfromanimals:theabilitytolaugh.Inauniversewhichappearst
AnewreportbytheU.N.AIDSorganizationsfindstheglobalAIDSepidemicisworsening.Theagencysaysmorepeopleinallregi
Accordingtothenewschoolofscientists,technologyisanoverlookedforceinexpandingthehorizonsofscientific’knowledge.
StandardEnglishisthevarietyofEnglishwhichisusuallyusedinprintandwhichisnormallytaughtinschoolsandtonon-nat
OnehundredandthirteenmillionAmericanshaveatleastonebank-issuedcreditcard.Theygivetheirownersautomaticcreditin
Amodernsupermarketcanbedividedintothreemainsections:theentrance-exitarea(includingcheckstands),thespacealongth
随机试题
世界非物质文化遗产资源丰富,形式多样,地域特色鲜明。下列非物质文化遗产中全部属于亚洲的是()。
His________haschangedbuthehaskeptthefinequalitiesofascientificresearcher.
你收到了某个社网邀请你加入的信函,但是山于学业较忙不能参加。清写一封拒绝信,委婉说明你不能参加的理由。
晶状体半脱位
填筑路堤时,( )施工取土坑应远离填方坡脚。
下列各项中,最终应计入产品生产成本的有()。
A.Title:MaintainingCulturalHeritagesofTraditionalHolidays B.Wordlimit:160-200words(notincludingthegivenop
下面说法中错误的是
向公司人力资源部分发一个E-mail,提出招聘要求,并抄送主管人事的李副经理。具体内容如下:【收件人】hr@mail.abe.com.cn【抄送】lijiang@mail.abc.com.cn【主题】招聘申请【函件内
Thepassingtravellersaid,"Whateveryouplease."itmeant(意指,意味着)Thecattookholdofthepoleandstartedtoclimbdownto
最新回复
(
0
)