Formation flight is more comfortable because passengers can not see the other planes.
Formation flight is more comfortable because passengers can not see the other planes.
相关考题：
I was worried very much because I’ll miss my flight if the bus arrives (). A.latelyB.lateC.latterD.more later
They() the virtues of humility because the more people they can persuade to be humble, the more easily they can both preserve and add to the power that they have. A、commitmentB、embankmentC、preachedD、glared
Ⅲ．阅读理解ATibet is among the most popular places for Chinese tourists． The number of travelers to Tibet has grown by 10% every year for a few years． Since July l，2006，when the first train ran 1956 kilometers from Xining to Lhasa，more and more people have been going to Tibet．The train stops at several famous places along the way， such as Qinghai Lake，Kunlun Mountain，and the Potala Palace． Passengers can also enjoy many activities during the journey，like Tibetan dancing and Karaoke．On the train，passengers can have tea，eggs and noodles for breakfast and fried chicken and green vegetables for lunch and dinner． Unlike most Chinese trains which have open-hole toilets，this one has special toilets which can collect the waste． There is also a special rubbish system (杀统) in the train that keeps environment clean． All the windows on the train can protect peo-ple from the bright sunlight． TV and electrical sockets(插座) for computers and mobile phones can be found on the train．Because there isn’t much oxygen there，trains will have oxygen masks(氧气罩)for those who need them．It makes passengers feel more comfortable when they have enough oxygen on the famous"roof of the world ．There are also doctors on the train to make sure that all of the travelers are safe．( )21． Which of the following is NOT among the places of interest?A． Qinghai LakeB． Karaoke．C． Kunlun Mountain．D． The Potala Palace．
More people visit the Air and Space Museum honoring men and women who have pioneered flight and the exploration of space than _____ any other monument or museum in the entire country.A:visitB:to visitC:visitedD:visiting
The writer suggests that pruning should be done in winter because______.A. the cut surface can heal more quicklyB. open wounds on the tree run the less risk of getting diseasedC. a gardener can do pruning more easilyD. the leaves can interfere
Everyone knows airline pricing is based on supply and demand. Fares are mores expensive during peak travel seasons like summer and to prime destinations like European capitals. So if a flight to Rome costs more than a flight to Milan you d think that demand for Rome must be higher or supply lowerWhat’s puzzling is that you can pay a high price to a given destination but a dramatically lower price for the exact same flight if you agree to go on to another destination.Take Alitalia to Rome for instance for travel in August A round-trip economy flight directly to Rome leaving JFK at 10:05 p.m on Alitalia 611 on August 5 costs $1,655 when booked on April 30 Compare that to $903 for a round-trip economy ticket to Milan(stopping in Rome)leaving JFK on the exact same Alitalia 611 flight at 10:05 p.m on August 5. So why is Alitalia willing to fly you to Rome for $752 less than it would otherwise plus give you an extra one-and-a-half-hour flight to Milan?Airlines have increased their profitability in recent years by segmenting the market for air travel and charging customers different prices for the same product. In this case the market is segmented based on demand for direct flights. Airlines know most people prefer the shortest route to their destination so they make customers pay up for the privilege of flying direct(They also make it a little more inconvenient if you don’t pay up for a direct flight in order to encourage you to fly direct)When process become so obviously illogical it may be time to why air tickets can’t be transferred or resold just like any other normal product If the airlines are entitled to exploit the free market shouldn’t customers be allowed to do the same thing? Why may prices for direct flights be higher according to the passage?A. Because all people prefer the shortest route to their destinationB. Because airlines take advantage of people’s preference for direct flightsC. Because connecting flights may cause inconvenienceD. Because airlines charge customers different prices for the same product
The flight attendants’ most important function is assisting passengers in the_______ of emergency.A.happening B.event C.opening D.affair
共用题干第二篇Human and the EarthIn terms of the evolution of life on Earth,human beings have just arrived.Despite their shori time on Earth,however,people have brought about enormous changes to the surface of the planet一changes far out of proportion to the interval of time they have occupied it.People have more control over their surroundings than any other species on Earth.With the combination of intelligence and manual skill(allowing us to make and use tools),people have found ways to use plant and animal resources,mineral ores,fuels,and many other materials and resources from the Earth.As the number of people on Earth increases,it becomes increasingly difficult for the population to survive on the resources of the land.The amount of land is limited.Although agricultural production can be increased by use of machinery such as tractors and the addition of fertilizer,the land ultimately can produce only so much food and no more.As the human population grows,people consume more.Clearly,some locations on Earth already have too many people;in many of these areas,future increases will surely bring about more poverty and suffering. Yet people in rich nations use proportionally far more of the available resources than people in poorer nations.As they consume these resources without restraint,they also waste large amounts of them.People are only a very small fraction of all the living things on the planet.Yet their numbers create a drain on resources that can't be renewed.For example,the amount of water on Earth is limited,this water is cleaned through natural processes.However,the natural processes for filtering water can clean only a certain amount of water by removing the pollution.Likewise,a limited amount of petroleum can be found under the Earth's surface.Petroleum is a valuable resource.Should people use it up to manufacture petrol for automobiles?As people work to control the planet and make life comfortable,are they using up resources that are needed for their survival?Why have people more control over their surroundings than any other species on Earth?A:Because of their intelligence and manual skill.B:Because they can use plant and animal resources,mineral ores and fuels.C:Because they are cleverer than any other animals on Earth.D:Both A and B.
On television all over the world there are programmes about the work of the police．They are popular because they are usually very exciting．In London there is a television programme called"Police Five"--because it is on for five minutes once a week．A television reporter,Shaw Taylor,talks about crimes in the London area．He asks for public help．The police station needs the help of ordinary people because sometimes you or I have information that can be useful to the police.Shaw Taylor shows pictures of paintings,jewellery(珠宝)and other things which thieves stole during the week．Sometimes he shows the car that the thieves escaped in．When people see men or things on the television programme which they may remember,they can tell the police where they saw them．With their help the police may catch more criminals.Sometimes the police find a car or some money．Shaw Taylor shows them on television．The owners sometimes see them．Then they can telephone the police and say,"Thank you very much--that's mine!"The television programme is called"Police Five",because it is about the work of the police and__.A.it is on for five times every seven daysB.it lasts five minutes a weekC.it begins at five in the afternoonD.it is a programme about five policemen
On television all over the world there are programmes about the work of the police．They are popular because they are usually very exciting．In London there is a television programme called"Police Five"--because it is on for five minutes once a week．A television reporter,Shaw Taylor,talks about crimes in the London area．He asks for public help．The police station needs the help of ordinary people because sometimes you or I have information that can be useful to the police.Shaw Taylor shows pictures of paintings,jewellery(珠宝)and other things which thieves stole during the week．Sometimes he shows the car that the thieves escaped in．When people see men or things on the television programme which they may remember,they can tell the police where they saw them．With their help the police may catch more criminals.Sometimes the police find a car or some money．Shaw Taylor shows them on television．The owners sometimes see them．Then they can telephone the police and say,"Thank you very much--that's mine!"When people see things stolen on the programme which they may remember,__.A.they try to get the things backB.they know their things have been stolenC.they know their things are at the police stationD.they tell the police the whereabouts of the shown things
Copying Birds May Save Aircraft FuelBoth Boeing and Airbus have trumpeted the efficiency of their newest aircraft.The 787 and 350 respectively.Their clever designs and lightweightcompositescertainly make a difference.But a group of researchers at Stanford University,led by Ilan Kroo,has suggested that airlines could take a more naturalisticapproach to cutting jet-fuel use and it would not require them to buy newaircraft.The answer,says Dr Kroo,lies with birds.Since 1914,scientists have known thatbirds flying in formation-a V-shape-expend less energy.The air flowing over abird's wings curls upwards behind the wingtips.a phenomenon known asupwash.Other birds flying in the upwash experience reduced drag,and spendless energy propelling themselves.Peter Lissaman,anaeronautics expert whowas formerly at Caltech and the University of Southern California,has suggestedthat a formation of 25 birds might enjoy a range increase of 71%.When applied to aircraft,the principles are not substantially different.Dr Krooand his team modeled what would happen if three passenger jets departing fromLos Angeles,San Francisco and I as Vegas were to assemble over Utah,assume aninverted V-formation occasionally change places so all could have a turn in themost favourable positions,and proceed to London.They found that the aircraftconsumed as much as 15%less fuel（coupled with a reduction in carbon-dioxideoutput）.Nitrogen-oxide emissions during the cruising portions of the flight fellby around a quarter.There are,of course,knots to be worked out.One consideration is safety,or atleast the perception of it.Would passengers feel comfortable travelling incompanion?Dr Kroo points out that the aircraft could be separated by severalnautical miles,and would not be in the intimate groupings favoured by displayteams like the Red Arrows,A passenger peering out of the window might noteven see the other planes.Whether the separation distances involved wouldsatisfy air-traffic-control regulations is another matter,although a working groupat the International Civil Aviation Organisation has included the possibility offormation flying in a blueprint for new operational guidelines.It remains to be seen how weather conditions affect the air flows that makeformation flight more efficient.In zones of increased turbulence,the planes'wakes will decay more quickly and the effect will diminish.Dr Kroo says this isone of the areas his team will investigate further.It might also be hard for airlinesto co-ordinate the departure times and destinations of passenger aircraft in a waythat would allow them to gain from formation flight.Cargo aircraft,in contrast,might be easier to reschedule,as might routine military flight.As it happens,America's armed forces are on the on case already.Earlier thisyear the country'S Defence Advanced Research Projects Agency announcedplans to pay Boeing to investigate formation flight,though the programme hasyet to begin.There are reports that some military aircraft flew in formation whenthey were low on fuel during the Second World War,but Dr Lissaman says theyare unsubstantiated."My father was an RAF pilot and my cousin the skipper of aLancaster lost over Berlin,"he adds.So he should knowThe upwash experience may save propelling energy as well as reducing resistance.
Copying Birds May Save Aircraft FuelBoth Boeing and Airbus have trumpeted the efficiency of their newest aircraft.The 787 and 350 respectively.Their clever designs and lightweightcompositescertainly make a difference.But a group of researchers at Stanford University,led by Ilan Kroo,has suggested that airlines could take a more naturalisticapproach to cutting jet-fuel use and it would not require them to buy newaircraft.The answer,says Dr Kroo,lies with birds.Since 1914,scientists have known thatbirds flying in formation-a V-shape-expend less energy.The air flowing over abird's wings curls upwards behind the wingtips.a phenomenon known asupwash.Other birds flying in the upwash experience reduced drag,and spendless energy propelling themselves.Peter Lissaman,anaeronautics expert whowas formerly at Caltech and the University of Southern California,has suggestedthat a formation of 25 birds might enjoy a range increase of 71%.When applied to aircraft,the principles are not substantially different.Dr Krooand his team modeled what would happen if three passenger jets departing fromLos Angeles,San Francisco and I as Vegas were to assemble over Utah,assume aninverted V-formation occasionally change places so all could have a turn in themost favourable positions,and proceed to London.They found that the aircraftconsumed as much as 15%less fuel（coupled with a reduction in carbon-dioxideoutput）.Nitrogen-oxide emissions during the cruising portions of the flight fellby around a quarter.There are,of course,knots to be worked out.One consideration is safety,or atleast the perception of it.Would passengers feel comfortable travelling incompanion?Dr Kroo points out that the aircraft could be separated by severalnautical miles,and would not be in the intimate groupings favoured by displayteams like the Red Arrows,A passenger peering out of the window might noteven see the other planes.Whether the separation distances involved wouldsatisfy air-traffic-control regulations is another matter,although a working groupat the International Civil Aviation Organisation has included the possibility offormation flying in a blueprint for new operational guidelines.It remains to be seen how weather conditions affect the air flows that makeformation flight more efficient.In zones of increased turbulence,the planes'wakes will decay more quickly and the effect will diminish.Dr Kroo says this isone of the areas his team will investigate further.It might also be hard for airlinesto co-ordinate the departure times and destinations of passenger aircraft in a waythat would allow them to gain from formation flight.Cargo aircraft,in contrast,might be easier to reschedule,as might routine military flight.As it happens,America's armed forces are on the on case already.Earlier thisyear the country'S Defence Advanced Research Projects Agency announcedplans to pay Boeing to investigate formation flight,though the programme hasyet to begin.There are reports that some military aircraft flew in formation whenthey were low on fuel during the Second World War,but Dr Lissaman says theyare unsubstantiated."My father was an RAF pilot and my cousin the skipper of aLancaster lost over Berlin,"he adds.So he should knowThe role that weather plays in formation flight has not yet been clearly defined.
Copying Birds May Save Aircraft FuelBoth Boeing and Airbus have trumpeted the efficiency of their newest aircraft.The 787 and 350 respectively.Their clever designs and lightweightcompositescertainly make a difference.But a group of researchers at Stanford University,led by Ilan Kroo,has suggested that airlines could take a more naturalisticapproach to cutting jet-fuel use and it would not require them to buy newaircraft.The answer,says Dr Kroo,lies with birds.Since 1914,scientists have known thatbirds flying in formation-a V-shape-expend less energy.The air flowing over abird's wings curls upwards behind the wingtips.a phenomenon known asupwash.Other birds flying in the upwash experience reduced drag,and spendless energy propelling themselves.Peter Lissaman,anaeronautics expert whowas formerly at Caltech and the University of Southern California,has suggestedthat a formation of 25 birds might enjoy a range increase of 71%.When applied to aircraft,the principles are not substantially different.Dr Krooand his team modeled what would happen if three passenger jets departing fromLos Angeles,San Francisco and I as Vegas were to assemble over Utah,assume aninverted V-formation occasionally change places so all could have a turn in themost favourable positions,and proceed to London.They found that the aircraftconsumed as much as 15%less fuel（coupled with a reduction in carbon-dioxideoutput）.Nitrogen-oxide emissions during the cruising portions of the flight fellby around a quarter.There are,of course,knots to be worked out.One consideration is safety,or atleast the perception of it.Would passengers feel comfortable travelling incompanion?Dr Kroo points out that the aircraft could be separated by severalnautical miles,and would not be in the intimate groupings favoured by displayteams like the Red Arrows,A passenger peering out of the window might noteven see the other planes.Whether the separation distances involved wouldsatisfy air-traffic-control regulations is another matter,although a working groupat the International Civil Aviation Organisation has included the possibility offormation flying in a blueprint for new operational guidelines.It remains to be seen how weather conditions affect the air flows that makeformation flight more efficient.In zones of increased turbulence,the planes'wakes will decay more quickly and the effect will diminish.Dr Kroo says this isone of the areas his team will investigate further.It might also be hard for airlinesto co-ordinate the departure times and destinations of passenger aircraft in a waythat would allow them to gain from formation flight.Cargo aircraft,in contrast,might be easier to reschedule,as might routine military flight.As it happens,America's armed forces are on the on case already.Earlier thisyear the country'S Defence Advanced Research Projects Agency announcedplans to pay Boeing to investigate formation flight,though the programme hasyet to begin.There are reports that some military aircraft flew in formation whenthey were low on fuel during the Second World War,but Dr Lissaman says theyare unsubstantiated."My father was an RAF pilot and my cousin the skipper of aLancaster lost over Berlin,"he adds.So he should knowFormation flight is more comfortable because passengers can not see theother plans.
Copying Birds May Save Aircraft FuelBoth Boeing and Airbus have trumpeted the efficiency of their newest aircraft.The 787 and 350 respectively.Their clever designs and lightweightcompositescertainly make a difference.But a group of researchers at Stanford University,led by Ilan Kroo,has suggested that airlines could take a more naturalisticapproach to cutting jet-fuel use and it would not require them to buy newaircraft.The answer,says Dr Kroo,lies with birds.Since 1914,scientists have known thatbirds flying in formation-a V-shape-expend less energy.The air flowing over abird's wings curls upwards behind the wingtips.a phenomenon known asupwash.Other birds flying in the upwash experience reduced drag,and spendless energy propelling themselves.Peter Lissaman,anaeronautics expert whowas formerly at Caltech and the University of Southern California,has suggestedthat a formation of 25 birds might enjoy a range increase of 71%.When applied to aircraft,the principles are not substantially different.Dr Krooand his team modeled what would happen if three passenger jets departing fromLos Angeles,San Francisco and I as Vegas were to assemble over Utah,assume aninverted V-formation occasionally change places so all could have a turn in themost favourable positions,and proceed to London.They found that the aircraftconsumed as much as 15%less fuel（coupled with a reduction in carbon-dioxideoutput）.Nitrogen-oxide emissions during the cruising portions of the flight fellby around a quarter.There are,of course,knots to be worked out.One consideration is safety,or atleast the perception of it.Would passengers feel comfortable travelling incompanion?Dr Kroo points out that the aircraft could be separated by severalnautical miles,and would not be in the intimate groupings favoured by displayteams like the Red Arrows,A passenger peering out of the window might noteven see the other planes.Whether the separation distances involved wouldsatisfy air-traffic-control regulations is another matter,although a working groupat the International Civil Aviation Organisation has included the possibility offormation flying in a blueprint for new operational guidelines.It remains to be seen how weather conditions affect the air flows that makeformation flight more efficient.In zones of increased turbulence,the planes'wakes will decay more quickly and the effect will diminish.Dr Kroo says this isone of the areas his team will investigate further.It might also be hard for airlinesto co-ordinate the departure times and destinations of passenger aircraft in a waythat would allow them to gain from formation flight.Cargo aircraft,in contrast,might be easier to reschedule,as might routine military flight.As it happens,America's armed forces are on the on case already.Earlier thisyear the country'S Defence Advanced Research Projects Agency announcedplans to pay Boeing to investigate formation flight,though the programme hasyet to begin.There are reports that some military aircraft flew in formation whenthey were low on fuel during the Second World War,but Dr Lissaman says theyare unsubstantiated."My father was an RAF pilot and my cousin the skipper of aLancaster lost over Berlin,"he adds.So he should knowIt has been documented that during World War I,America's armed forcesonce tried formation flight to save fuel.
资料：Everyone knows airline pricing is based on supply and demand. Fares are more expensive during peak travel seasons like summer and to prime destinations like European capitals. So if a flight to Rome costs more than a flight to Milan, you'd think that demand for Rome must be higher or supply lower.What's puzzling is that you can pay a high price to a given destination but a dramatically lower price for the exact same flight if you agree to go on to another destination.Take Alitalia to Rome, for instance, for travel in August. A round-trip, economy flight directly to Rome leaving JFK at 10:05 p.m. on Alitalia 611 on August 5 costs $1,655 when booked on April 30. Compare that to $903 for a round-trip, economy ticket to Milan （stopping in Rome） leaving JFK on the exact same Alitalia 611 flight at 10:05 p.m. on August 5. So why is Alitalia willing to fly to Rome for $752 less than it would otherwise, plus give you an extra one-and-a-half-hour flight to Milan?Airlines have increased their profitability in recent years by segmenting the market for air travel and charging customers different prices for the same product. In this case, the market is segmented based on demand for direct flights. Airlines know most people prefer the shortest route to their destination, so they make customers pay up for the privilege of flying direct. （They also make it a little more inconvenient if you don't pay up for a direct flight, in order to encourage you to fly direct.）When prices become so obviously illogical, it may be time to revisit why air tickets can't be transferred or resold just like any other normal product. If the airlines are entitled to exploit the free market, shouldn't customers be allowed to do the same thing?Why may prices for direct flights be higher according to the passage?A.Because all people prefer the shortest route to their destination.B.Because airlines take advantage of people’s preference for direct flights.C.Because connecting flights may cause some inconvenience.D.Because airlines charge customers different prices for the same product.
A user in the op_storage group logs onto the DS GUI and goes to the User Administration panel. Which users can be seen and what actions can be performed（）A、the user can see all other users， including those in the Admin group， but can modify only the user accounts in theOp_volume and Monitor groupB、the user can see all the users except those in the Admin group， but can only modify the user’s own accountC、the user can see only the user’s own account， and cannot modify itD、the user can see only the user’s own account， and can change the password only
单选题The term bumped (line 2) most nearly means ______.Amoving up from coach to first class on your scheduled flightBgiving up your seat in exchange for a seat on a later flight and other compensationCpaying a small fee to be chosen for a better flightDexchanging your airline ticket for a voucher and choosing another means of transportationEselling your airline tickets to other passengers to make money
单选题A flight to other solar systems will be made more possible by ______.Atechnological breakthroughs.Binternational co-operation.Cmarket competition.Dpublic pressure.
单选题Which of the following is not the advantage of the Internet?Athe news can be made more democraticBthe public can turn to different sourcesCthe public can get a chance to ask questionsDanything can be posted on the Internet for others to see
单选题People like staying in their comfort zone because they may ______.Aremain comfortable and specialBbe accepted easily and feel safeCfind out more interesting thingsDdiscover differences among themselves
单选题One distinct advantage of flash type evaporators, as compared to most other evaporators, is that in a flash evaporator （）.Ahigh temperature distillate can be re- circulated to induce additional flashingBscale formation is not a severe problemCcold shocking is more effective in removing scaleDwater purity is greatly increased at high capacity
单选题Now Mr. LaRoche chooses to use Logan airport instead of Montreal airport because ______.Athe former is cheaper in serviceBthe former gives more care to car theftCthe former is more convenient for parkingDthe former shows more concern for passengers
单选题Some people start Buy Nothing Day because they think _____ .Apeople need more time to do other thingsBpeople buy too many gifts for ChristmasCpeople can hardly afford to buy a lot of giftsDpeople waste too much time going shopping
单选题It can be inferred from this passage that ______.Aairlines used to offer additional benefits to passengers who volunteered to be bumpedBvolunteering to be bumped is always a lucrative dealCwhen you are bumped to a different flight you usually have to wait only a few minutesDoverbooking flights is a growing practice in the airline industryEfree－flight vouchers have fewer limitations than do vouchers for only a specified dollar amount
单选题What advantage does Room 402 have over auditorium 2?AIt can seat more people.BIt has better technology.CIts seats are more comfortable.DIt was recently refurbished.