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
44
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
WhendidthePolosarriveinChina?
Menlietowomen.Attheheartofmanymen’slies,however,isthemaleego.Menlietobuildthem-selvesuportoconcealsome
Whatdoscientiststellusaboutjobsinforeseeablefuture?
Broadlyspeaking,theEnglishmanisaquiet,shy,reservedpersonwhoisfully【21】______onlyamongpeopleheknowswell.
Broadlyspeaking,theEnglishmanisaquiet,shy,reservedpersonwhoisfully【21】______onlyamongpeopleheknowswell.
Healthimpliesmorethanphysicalfitness.Italsoimpliesmentalandemotionalwell-being.Anangry,frustrated,emotionally【
ThecoreofGreece’stroublesistoomuchspending,toolittletax-collectingandbook-cooking.SpainandIrelandareintroubl
WhatisEinstein’sgreatestcontributiontohumanbeings?
SusanCarter
1,050pounds
随机试题
简述我国企业生产与作业出现安全问题的主要原因。
患者女,45岁。1周前发现有乳外上象限结节,直径约1.5cm,较硬,活动,无压痛,两侧乳腺对称,乳头及皮肤无特殊,两侧腋下均未及淋巴结,患乳无炎症或创伤史,钼靶拍片X线检查发现患乳有细小钙化点。保乳术的适应证包括
医生用较轻的指力诊脉的手法是()
()是指由中央政府制定的全国规划,关系到国家的全局和长远利益。在制定国家级规划时,应考虑到地方的实际,照顾到地方的利益。
()建立预警评价指标体系的目的是使信息定量化、()和可操作化。
会计人员不钻研业务,不加强新知识的学习,造成工作上的差错,缺乏胜任工作的能力。这是一种既违反会计职业道德,又违反会计法律制度的行为。()
生产车间发生的制造费用分配后,一般应计入()科目。
公安工作的成败,公安队伍战斗力的强弱,取决于公安装备中的科技含量。( )
甲投毒杀其妻子乙,乙服毒后痛苦万分,甲心生怜悯之情,将乙送至医院救治。但由于药性猛烈,乙抢救无效死亡。甲的行为成立()
Choosethecorrectletter,A,BorC.WhatshouldyoudotogettheGlobalTravelingCertificate?
最新回复
(
0
)