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
You never see them, but they’re with you every time you fly. They record where you’re going, how fast you’re traveling and wheth
You never see them, but they’re with you every time you fly. They record where you’re going, how fast you’re traveling and wheth
admin
2013-05-19
87
问题
You never see them, but they’re with you every time you fly. They record where you’re going, how fast you’re traveling and whether everything on your airplane is functioning normally. Their ability to withstand almost any disaster makes them seem like something out of a comic book. They’re known as the black box.
When planes fall from the sky, as a Yemeni airliner did on its way to the Comoros Islands in the Indian Ocean June 30, 2009, the black box is the best bet for identifying what went wrong. So when a French submarine (潜水艇) detected the device’s homing signal five days later, the discovery marked a huge step toward determining the cause of a tragedy in which 152 passengers were killed.
In 1958, Australian scientist David Warren developed a flight-memory recorder that would track basic information like altitude and direction. That was the first model for a black box, which became a requirement on all U. S. commercial flights by 1960. Early models often failed to withstand crashes, however, so in 1965 the device was completely redesigned and moved to the rear of the plane—the area least subject to impact—from its original position in the landing wells (起落架舱). That same year, the Federal Aviation Authority required that the boxes, which were never actually black, be painted orange or yellow to aid visibility.
Modern airplanes have two black boxes: a voice recorder, which tracks pilots’ conversations, and, a flight-data recorder, which monitors fuel levels, engine noises and other operating functions that help investigators reconstruct the aircraft’s final moments. Placed in an insulated (隔绝的) case and surrounded by quarter-inch-thick panels of stainless steel, the boxes can withstand massive force and temperatures up to 2,000°F. When submerged, they’re also able to emit signals from depths of 20,000 ft. Experts believe the boxes from Air France Flight 447, which crashed near Brazil on June 1, 2009, are in water nearly that deep, but statistics say they’re still likely to turn up. In the approximately 20 deep-sea crashes over the past 30 years, only one plane’s black boxes were never recovered.
Why does Michelle Obama hold a strong fascination for the author?
选项
A、She serves as a role model for African-America women.
B、She possesses many admirable qualities becoming the First Lady.
C、She will present to the world a new image of African-America.
D、She will pay closer attention to the interests of African-America.
答案
D
解析
推理判断题。本题的答案要从整篇文章来分析。可以使用排除法。选项A)它确保飞机正常运行。根据第一段第二句,They record where you’re going,how fast you’re traveling and whether everything on your airplane is functioning normally.(它们记录你的飞行路线、速度以及你所在的飞机是否一切运转正常。)可知黑匣子的功能是记录而不是确保飞机正常运行,因此不能选。根据文章第一段第三句, Their ability to withstand almost any disaster makes them seem like something out of a comic book. (它们几乎能抵抗一切灾难的能力使之看起来像出自于漫画书中。)可知它的设计并不是出自于漫画书,选项B不符合。选项C(它防止灾难发生的能力非常惊人),从全文可知黑匣子的功能不是防止灾难发生而是可以记录飞行信息,因此也排除。选项D(它是飞机上不可或缺的装置)符合原文,因此选D。
转载请注明原文地址:https://kaotiyun.com/show/xJg7777K
0
大学英语四级
相关试题推荐
Mostepisodesofabsent-mindedness—forgettingwhereyouleftsomethingorwonderingwhyyoujustenteredaroom—arecausedbya
Wheredopesticidesfitintothepictureofenvironmentaldisease?Wehaveseenthattheynowpollutesoil,water,andfood,tha
Anewanalysisoffederalmoneythatpublicschoolsreceiveforlow-incomestudentsshowsthatarecordnumberofthenation’ss
Thecommunicationsexplosionisonthescaleoftherail,automobileortelephonerevolution.Verysoonyou’llbeabletorecord
Forsomeeducators,thereisnothingwrongwithfunandgames.AgroupcalledtheEducationArcaderecentlyheldaconferencein
Forsomeeducators,thereisnothingwrongwithfunandgames.AgroupcalledtheEducationArcaderecentlyheldaconferencein
Forthispart,youarerequiredtowriteacompositiononthetopicIsJob-hoppingPreferable?accordingtothefollowingoutl
A、Ithasbeenproventobe.thebestpain-killer.B、Itisapossiblecureforheartdisease.C、Itcanhelplowerhighbodytempe
AcademyAwardsEveryFebruaryOscarFeverhitstheentertainmentcommunityandfilmfansaroundtheworld.Hundredsofmilli
AcademyAwardsEveryFebruaryOscarFeverhitstheentertainmentcommunityandfilmfansaroundtheworld.Hundredsofmilli
随机试题
什么是物理设备?什么是逻辑设备?两者有什么区别与联系?
Iwouldliketomakearequest______acontribution.
非霍奇金淋巴瘤与Ewing肉瘤的区别
从事建筑活动的企业或单位,应当向()申请设立登记,并由建设行政主管部门审查,颁发资格证书。
假设其他因素不变,某企业存在经营杠杆效应和财务杠杆效应,当固定性资本成本下降时,经营杠杆系数会()。
甲公司准备变更信用政策,拟选用缩短信用期或提供现金折扣两项措施之一。下列关于两项措施相同影响的说法中,正确的有()。
某炮弹生产厂生产的一种造价昂贵的重型炮弹的质量特性有:炮弹射程、炮弹内的弹药重量、弹壳的直径。对炮弹内的弹药重量进行抽样检验,并规定超标即为不合格,()。
中国特色社会主义的本质属性是社会和谐。()
构造主义认为,心理学的研究对象是()
请从以下供选择的答案中为index.asp文档程序中(1)~(5)处空缺部分选择正确答案。(1)A.CreateObjectB.ConnectC.ExecuteSQLD.Open()(2)A.<body>B.<ht
最新回复
(
0
)