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
43
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、It’ s about the tests of a new airliner before its flying.
B、It’ s about how to protect a new airliner.
C、It’ s about how to train a new pilot.
D、It’ s about what the airliner engineers should do.
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/IGCd777K
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
AnewlypublishedAIDSstudycouldopenanotherfrontinthebattleagainstHIVinfectionbyshowingthatgenetherapycanbeus
Howlongwastheholiday?
Itwasunfortunatethat,aftersotrouble-freeanarrival,heshouldstumbleinthedarkashewasrisingandseverelytwisth
Itwasunfortunatethat,aftersotrouble-freeanarrival,heshouldstumbleinthedarkashewasrisingandseverelytwisth
Peopleappeartobeborntocompute.Thenumericalskillsofchildrendevelopsoearlyandsoinexorablythatitiseasytoimag
Whathavescientistsdiscoveredaboutplantsandinsects?
TheWorldHealthOrganization(WHO)isintrouble.Itsleaderisaccusedoffailingtolead,andastheorganizationdrifts,oth
ManyUnitedStatescompanieshave,unfortunately,madethesearchforlegalprotectionfromimportcompetitionintoamajorline
failure
therapist
随机试题
由足背静脉弓注入抗生素,药物经哪些具体途径到达阑尾?
A.血、尿、大便常规检查B.病理检查C.内镜检查D.影像学检查E.肿瘤标志物直接观察肿瘤
口腔肿瘤联合根治术一般使用下列哪种麻醉方法
除涉及国家秘密的外,仲裁应公开进行。()
测题编制的方式颇多,常见的有()。
某年我国夏季,在北印度洋阿拉伯海海域,一艘油轮的原油大量泄漏,则油污带可能漂向:
一个国家的货币贬值意味着()。
"Everythinghappensforthebest",mymothersaid(31)Ifaceddisappointment."Ifyoucarryon,onedaysomethinggoodwill(32
Whoisthewoman?
回扣()反倾销()贸易逆差()随行就市()
最新回复
(
0
)