Flying the Hypert1 Skies
The Hyper-X2 recently broke the record for air-breathing jet planes when it traveled at a hypersonic speed of seven times the speed of sound.Thats about 5,000 miles per hour.At this speed,youd get around the world flying along the equator in less than 5 hours.
For an engine to burn fuel and produce energy,it needs oxygen.A jet engine,like those on passenger airplanes,gets oxygen from the air.A rocket engine typically goes faster but has to carry its own supply of oxygen.A scramjet engine goes as fast as a rocket,but it doesnt have to carry its own oxygen supply.A scramjets special design allows it to obtain oxygen from the air that flows through the engine.And it does so without letting the fast-moving air put out the combustion flames. However,a scramjet engine works properly only at speeds greater than five times the speed of sound.A booster rocket carried the Hyper-X to an altitude of about 100,000 feet for its test flight.The aircrafts record-beating flight lasted just 11 seconds.Although the little planes self-powered flight lasted only 11 seconds,that brief journey on March 27 makes a major milestone on the way to a new breed of very fast airplanes,comments Werner J.A.Dahm of the University of Michigan in Ann Arbor4.In the future,engineers predict,airplanes equipped with scramjet engines could transport cargo quickly and cheaply to the brink of space. Such hypersonic jets could potentially carry passengers anywhere in the world in just a few hours.
词汇:7haipE5sCnik 5bu:stEp
equator n.赤道 milestonen.里程碑
scramjetn.超音速燃烧冲压式, cargon.货物
combustionn.燃烧 brinkn.边缘
1. The Hyper-X broke the record because
B it flew along the equator.
D it traveled at a supersonic speed.
A A jet engine that gets oxygen from the air.
C A rocket engine that carries its own supply of oxygen.
3. What is NOT true about the scramjet engine?
B It extracts oxygen from the air that flows through the engine.
D It doesnt carry its own oxygen supply.
flight?
B It was self-powered,so it lasted only 11 seconds.
D It is a major milestone in the journey of making a new type of very fast airplanes,
A To make another 11-second hypersonic flight at 10 times the speed of the sound.
C To retest the aircraft that is left.
答案与题解:
2. B 第四段讲了三种发动机的氧气喷气式发动机是从空气中汲取氧气,火箭发动机必须自携氧气,而超音速冲压喷气发动机则不必白携氧气,而这正是Hyper-X使用的发动机装置。
4. D 文章的第六段中,密歇根大学的研究人员Werner J.A.Dahm说,Hyper-X的试飞成功只是研制一种新式快速飞机过程中的一个里程碑,而不是新型飞机的诞生。所以,D是正确选择,A是错误选择。B也不是Werner J.A.Dahm想要表达的意思。C是其他下程师而不是Werner J.A.Dahm说的话。
娱乐英语资讯:Rod Stewart bans daughter from modeling undieworld
娱乐英语资讯:Wood plans to cover up Beatles tattoo
娱乐英语资讯:Rome International Film Festival opens
娱乐英语资讯:Beyonce tops People fashion list
娱乐英语资讯:Martin and Paltrow name Pegg as godfather
娱乐英语资讯:Lindsay Lohan says rehab was sobering
娱乐英语资讯:Kylie Minogue: Will I EVER get to walk down the aisle?
娱乐英语资讯:Nicole Richie enters anti-drinking program
娱乐英语资讯:Celebs at the 59th Primetime Emmy Awards
娱乐英语资讯:Brad Pitt ready to rumble in boxing movie
娱乐英语资讯:Witherspoon had panic attacks after divorce
娱乐英语资讯:Eva desperately takes hubbys name
娱乐英语资讯:Britney fans being urged to boycott her new album
娱乐英语资讯:Lindsay Lohan to be freed from rehab this week
娱乐英语资讯:Kylie emerges with a new single and dazzling make-over
娱乐英语资讯:Accused Uma Thurman stalker indicted
娱乐英语资讯:Lindsay Lohan checks out of rehab: report
娱乐英语资讯:Charlotte Church names her baby girl
娱乐英语资讯:Jennifer Aniston tops US magazine cover face list
娱乐英语资讯:Gisele Bundchen wears nothing but a dripping wet dress
娱乐英语资讯:Ruff diamonds: The 2,500 Vivienne Westwood dog coat
娱乐英语资讯:Quickie Vegas wedding for Pamela Anderson
娱乐英语资讯:Halle Berry desperate to work in beaus restaurant
娱乐英语资讯:New curvier Nicole Richies beach life
娱乐英语资讯:Wedding bells not far off for Pamela Anderson
娱乐英语资讯:Linday Lohan crash lawsuit will go to trial
娱乐英语资讯:Beach Bunny: At LA Fashion Week Spring 2008
娱乐英语资讯:Colour, art prevail at Milan Fashion Week
娱乐英语资讯:Scarlett Johansson donates money for Sri Lankan kids
娱乐英语资讯:Paris wants to shed her party-girl image
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |