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
2022-01-20
65
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.
[A] figures out that all the airlines are advancing preparations for climate change.
[B] holds the view that airlines don’t put more emphasis on longer-term issues of climate change.
[C] believes that decreasing payload of cargo or passengers can make airplane take off.
[D] says that downplaying the importance of atmosphere is not right.
[E] points out that global warming is not the only reason for airline service disruption.
[F] thinks that the smaller airplane cannot operate over 118 degrees.
[G] considers that the plane was grounded for hours, which has a knock-on effect on airline operations.
David Wilhelm
选项
答案
C
解析
由题干关键词David Wilhelm可定位到第六段倒数第一、二句Typically in the hotter days of the summer,you may have to bump payload,which includes cargo and/or passengers…reducing weight allows a plane to take off with less lift(通常,在夏季比较炎热的日子里,你可能必须降低载量,包括货物和/或乘客,……减轻重量能让一架飞机以更低的升力起飞)。通过对比选项可知,C项为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/nBi4777K
0
考研英语二
相关试题推荐
Overthepastdecade,manycompanieshadperfectedtheartofcreatingautomaticbehaviors-habits-amongconsumers.Thesehabits
Nameshavegainedincreasingimportanceinthecompetitiveworldofhighereducation.Ascollegesstriveformarketshare,they
TheUnitedStateshashistoricallyhadhigherratesofmarriagethanthoseofotherindustrializedcountries.Thecurrentannual
TheUnitedStateshashistoricallyhadhigherratesofmarriagethanthoseofotherindustrializedcountries.Thecurrentannual
Oneofthemosteminentofpsychologists,ClarkHull,claimedthattheessenceofreasoningliesintheputtingtogetheroftwo
Officejobsareamongthepositionshardesthitbycomputation(计算机自动化).Wordprocessorsandtypistswillloseabout93,000jobs
[A]PickUptheLocalPaper[B]SavefromtheFirstPlace[C]UseaGuidebook—YourOwn[D]PickUpthePhone[E]
BillGateswas20yearsold.SteveJobswas21.WarrenBuffettwas26.RalphLaurenwas28.EsteeLauderwas29.Thesenowi
WarrenBuffett,whowillhostBerkshireHathaway’sannualshareholders’meetingonMay3rd,isaniconofAmericancapitalism.A
WarrenBuffett,whowillhostBerkshireHathaway’sannualshareholders’meetingonMay3rd,isaniconofAmericancapitalism.A
随机试题
IngmaBergman’slatestworkasascreenwriteris"Sunday’sChildren".SetinruralSwedenduringthelate1920s,thestorycent
聚酰胺在__中对黄酮类化合物的吸附最弱
王某因盗窃罪被法院判处有期徒刑3年,刑罚执行1年以后,王某以患有严重疾病、生活不能自理为由,申请暂予监外执行,请根据本案情况回答下列问题:对于暂予监外执行的王某:()
计算机代替手工记账的基本条件是()。
证券投资咨询机构需在每逢单月的前()个工作日内,将本机构及其执业人员前2个月所推荐的证券在推荐时和推荐后1个月所涉及的各种情况,向注册地的中国证监会派出机构提供书面备案材料。
肖云与某单位签订了一份劳动合同,在该单位干了6个月时间。该劳动合同被法院确认为无效劳动合同。下列()不能导致出现这种情况。
意志的品质包括()。
给定材料1.新媒体是新的技术支撑体系下出现的媒体形态,如数字杂志、数字报纸、数字广播、手机短信、移动电视、网络、桌面视窗、数字电视、数字电影、触摸媒体等。相对于报刊、户外、广播、电视四大传统意义上的媒体,新媒体被形象地称为“第五媒体”。根据20
就给定资料反映的问题,用不超过200字进行概括,要求:全面,有条理,有层次。就给定资料自选角度,自拟标题,写一篇1000字左右的文章。要求中心明确,内容充实,论述深刻,有说服力。
下列财产可以设定抵押权的是()。
最新回复
(
0
)