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
考研
In recent days, American Airlines has been forced to cancel more than 40 flights in Phoenix. The reason: With daytime highs hove
In recent days, American Airlines has been forced to cancel more than 40 flights in Phoenix. The reason: With daytime highs hove
admin
2019-11-20
105
问题
In recent days, American Airlines has been forced to cancel more than 40 flights in Phoenix. The reason: With daytime highs hovering around 120 degrees, it was simply too hot for some smaller jets to take off. Hotter air is thinner air, which makes it more difficult—and sometimes impossible—for planes to generate enough lift. As the global climate changes, disruptions like these are likely to become more frequent, researchers say, potentially making air travel costlier and less predictable with a greater risk of injury to travelers from increased turbulence.
"We tend to ignore the atmosphere and just think that the plane is flying through empty space, but of course, it’s not," said Paul D. Williams, a professor in the Department of Meteorology at the University of Reading in Britain. "Airplanes do not fly through a vacuum. The atmosphere is being modified by climate change." The problem in Phoenix primarily affected smaller jets operated by American’ s regional partner airlines.
"When you get in excess of 118 or higher, you ’re not able to take off or land," said Ross Fein-stein, a spokesman for American Airlines, referring to the smaller aircraft. Bigger jets like Boeing 737s and Airbus A320s have higher operating thresholds (126 and 127 degrees, respectively), he said. But even though bigger planes weren ’t affected, he added, American decided to give passengers on any flight to or from Phoenix the option to change their trips.
Overall, that means more than 350 flights were potentially affected by the hot weather in Phoenix. Robert Mann, the president of airline industry analysis firm R.W. Mann & Co., said that although airlines were working to become more efficient now, they were not doing much to prepare for the longer-term effects of climate change. "In a world where they’re focused on near-term issues, the glacial rate of environmental change is not within their fleet-planning horizon," he said.
Researchers are just beginning to explore how climate change affects aviation and planes’ ability to fly. Because there is so little data available and so many factors at play—aircraft design, airport size and location, the weight of passengers and cargo, to name just a few—it can be hard to attribute any one service disruption to global warming.
Depending on their locations, airports may experience the effects differently. La Guardia has a short runway relative to other major commercial airports, and on particularly hot days that can be a problem: Planes might not have enough distance to achieve the speed and lift needed to get airborne. "Typically in the hotter days of the summer, you may have to bump payload, which includes cargo and / or passengers," said David Wilhelm, a senior dispatch manager at Southwest Airlines. Reducing weight allows a plane to take off with less lift.
As global temperatures continue to rise, some of the heaviest planes on the longest flights may eventually be unable to depart during the hottest part of summer days, Radley Horton said, a research scientist at Columbia University’s Earth Institute. He also pointed out that a no-fly window of even a few hours at a particular airport could have a ripple effect across airline operations.
With forecasts predicting record-breaking temperatures in Phoenix on Tuesday—and some flights being canceled pre-emptively—many passengers stayed away from the airport entirely.
选项
答案
F
解析
由题干关键词Ross Feinstein可定位到第三段首句When you get in excess of 118 or higher,you’re not able to take off or land…referring to the smaller aircraft(如果气温超过118华氏度,飞机就无法起飞或降落……他指的是小型飞机”)。对比选项可知,F项“小型飞机在气温超过118华氏度就无法进行操作”是该句的同义替换,故本题选F。
转载请注明原文地址:https://kaotiyun.com/show/hpe4777K
0
考研英语二
相关试题推荐
ThewriterwarnsAmericansthat______.Whatistheconclusionofthispassage?
WhichofthefollowingbestdescribestheAmerica’seconomicsituation?Whatistheauthor’sattitudetowardsomerecentfigure
Amajorreasonforconflictintheanimalworldisterritory.Themaleanimal(21)anarea.Thesizeoftheareaissufficientt
Amajorreasonforconflictintheanimalworldisterritory.Themaleanimal(21)anarea.Thesizeoftheareaissufficientt
Amajorreasonforconflictintheanimalworldisterritory.Themaleanimal(21)anarea.Thesizeoftheareaissufficientt
Amajorreasonforconflictintheanimalworldisterritory.Themaleanimal(21)anarea.Thesizeoftheareaissufficientt
Overthepastdecade,manycompanieshadperfectedtheartofcreatingautomaticbehaviors-habits-amongconsumers.Thesehabits
Anunremarkedconsequenceofournewinformationage—onethatwillinfluencereaders,writers,andpublishersinthefuture—ist
In2010,afederaljudgeshookAmerica’sbiotechindustrytoitscore.CompanieshadwonpatentsforisolatedDNAfordecades--b
随机试题
A、Itisaformthathelpsthestudentgetastudentvisa.B、Itisacertificatethatshowsthestudent’sEnglishproficiency.C、
下列教育投资规划的工具中,属于长期教育投资规划工具的有()。
甲喜好文学并极具文学天赋,11岁时写了儿童小说《同桌》,同年将该小说的网络传播权转让给某网站。甲的父母得知此事后极力反对该转让行为。下列说法正确的是()。
古典总供给曲线成立的假设前提是()。
按照ITU标准,传输速率为622.080Mbps的标准是()。
某数据库的表中要添加Internet站点的网址,应该采用的字段类型是。()。
走近深圳这座现代化的大都市里,我们的感受是什么?与朋友打电话时,经常从他们口中听到这样的话:好累啊,压力好大啊,永远都有干不完的工作啊……现在最流行的一个词是:在路上;最流行的一句感慨是:活得好累!都市人,一如海德格尔形容的“沉沦于操劳和操持之中”,连偶尔
PoliceinthepopularresortcityVirginiaBeachrecentlybeganoperatingvideosurveillancecameraswithcontroversialfacerec
WhatdoesNancylike?
InternationalPublishingHouse119SharonRoad,5thFloor,Room503Tel:549-0344Fa
最新回复
(
0
)