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
100
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
B
解析
由题干关键词Robert Mann可定位到第四段第二句although airlines were working to become more efficient now,they were not doing much to prepare for the longer-term effects of climate change(虽然现在航空公司正努力提高效率,但他们并没有为气候变化的更长期影响做充分准备)。通过对比选项可知,B项“航空公司并没有对气候变化这个长期问题加以重视”与该句在意思上表述一致,故本题选B。
转载请注明原文地址:https://kaotiyun.com/show/mpe4777K
0
考研英语二
相关试题推荐
ThewriterwarnsAmericansthat______.Whatistheconclusionofthispassage?
ThewriterwarnsAmericansthat______.Thewritergivestheexampleofbreadtoshowthat______.
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
Overthepastdecade,manycompanieshadperfectedtheartofcreatingautomaticbehaviors-habits-amongconsumers.Thesehabits
Conveniencefoodhelpscompaniesbycreatinggrowth;butwhatisitseffectonpeople?Forpeoplewhothinkcookingwasthefoun
随机试题
《香市》中写道“社庙的左屋被‘公安分局’借去做了衙门”,“社庙的左偏殿上又有什么‘蚕种改良所’的招牌”。这里运用的:表现手法是()
某项经济业务的发生引起了负债和所有者权益的变化,当负债为减少时,所有者权益的变化是______。
9月10日,白糖现货价格为4300元/吨,某糖厂决定利用白糖期货对其生产的白糖进行套期保值。当天以4350元/吨的价格在11月份白糖期货合约上建仓。10月10日,白糖现货价格跌至3800元/吨,期货价格跌至3750元/吨,该糖厂将白糖现货售出,并将
(2010、2009年考试真题)股息率可调整优先股的股息率变化主要由()决定。
下列关于资产的摊销处理中,正确的是()。
某公司向银行申请贷款,并约定以质押的形式提供担保。下列可作为质押物的有()。
延安整风运动最主要的任务是
标志着第一次国共合作正式形成的是()
请在【答题】菜单下选择【进入考生文件夹】命令,并按照题目要求完成下面的操作。注意:以下的文件必须保存在考生文件夹下。为了更好地控制教材编写的内容、质量和流程,小李负责起草了图书策划方案(请参考“图书策划方案.docx”文件)。他需要将图
Whatisthejournalistaccusedof?
最新回复
(
0
)