1、2018 年职称英语考试理工类B 级练习阅读理解（4）职称英语理工 BFlying the Hypert SkiesA little airplane has given new meaning to the term going hyper.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.That s about 5,000 miles per hour.At
2、this speed,you d get around the world flying along the equator in less than 5 hours.The Hyper-X is an unmanned,experimental aircraft just 12 feet long. It achieves hypersonic speed using a special sortof engine known as a scramjet3.It maysound like something from a ic book,but engineers have been ex
3、perimenting with scramjets since the 1960s.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 buthas to carry its own supply of oxygen.A scramjet engine goesas fast as a rocket,bu
4、tit doesnthave to carryitsown oxygensupply.A scramjets special design allows it to obtain oxygenfrom the air that flows through the engine.And it does sowithoutlettingthefast-moving air putout the bustionflames.However,a scramjetengine works properlyonlyat speeds greaterthan fivetimesthe speed ofsou
5、nd.A booster rocketcarried theHyper-X to an altitude of about 100,000 feet for its testflight.The aircrafts record-beating flight lasted just 11seconds.Althoughthe littleplanes self-poweredflightlastedonly 11 seconds,that brief journey on March 27 makes a majormilestone on the way toa new breed ofve
6、ry fastairplanes,mentsWerner J.A.Dahm oftheUniversityofMichiganinAnn Arbor4.Inthe future,engineerspredict,airplanesequippedwithscramjetenginescould transportcargo quicklyand cheaplytothe brinkof space. Such hypersonic jets could potentially carry passengers anywhere in the world in just a few hours.
7、Out of the three experimental Hyper-X aircrafts built for NASA5,only one is now left.The agency has plans for another11-second hypersonic flight,this time at 10 times the speed of the sound.词汇hypersonic/7haipE（：） 5sCnik/adj.超音速的 booster/ 5bu：stE/n. 助推器equator/i5kweitE（r ）/ n. 赤道 milestone/5mailstEun
8、/n.里程碑unmanned/Qn5mAnd/adj. 无人的 booster rocket助推火箭scramjet/5skrAmdVet/n.超音速燃烧冲压式 , cargo/5kB ：Eu/n.货物喷气发动机bustion/kEm5bQstFEn/n.燃烧 brink/briNk/n.边缘练习：1. The Hyper-X broke the record becauseA it was the first air-breathing jet plane.B it flew along the equator.C it flew at speeds smaller than five ti
9、mes the speed ofsound.D it traveled at a supersonic speed.2. What kind of an engine did the Hyper-X use A A jet engine that gets oxygen from the air.？BA scramjet engine thatdoesnt carry itsown oxygen supply.C A rocket engine that carries its own supply of oxygen.D A iet engine that uses no oxygen.3.
10、 What is NOT true about the scramjet engine A It goes slower than a rocket.？B It extracts oxygen from the air that flows through the engine.CIt works only atspeeds greater thanfive timesthespeedof sound.D It doesnt carry its own oxygen supply.4. What did Werner J.A.Dahm of the University of Michigan
11、say about the Hyper-X test flight？A It indicated the birth of a very fast airplane.B It was self-powered,so it lasted only 11 seconds.C It can transportcargo quickly and cheaply to the brink of space.D It is a major milestone in the journey of making a new type of very fast airplanes,5. What has NAS
12、A planned to do？A To make another 11-second hypersonic flight at 10 times the speed of the sound.B To make three more Hyper-X experiments.C To retest the aircraft that is left.D To make the aircraft fly higher and longer.答案与题解：1.C Hyper-X 之所以打破纪录是因为它的飞行速度是音速的7 倍。它不是第一架空气喷气式飞机, 也不是第一架超音速飞机, 所以 A 和 D都
13、不对。 Hyper-X 的试飞并未绕赤道飞行 , 所以 B 也是错误的选择。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。3. A 根据第五段内容 ,B 、C、D 都是正确的说法。第四段最后一句告诉我们 ,A 的说法是不正确的。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（ a major milestone on the way to a new breed of very fast airplanes ）, 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。5. A 答案可在最后一段找到。内容仅供参考
