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B.docx

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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BFlyingtheHypertSkiesAlittleairplanehasgivennewmeaningtotheterm"goinghyper."TheHyper-X2recentlybroketherecordforair-breathingjetplaneswhenittraveledatahypersonicspeedofseventimesthespeedofsound.That‘sabout5,000milesperhour.Atthisspeed,you’dgetaroundtheworld—flyinga

2、longtheequator—inlessthan5hours.TheHyper-Xisanunmanned,experimentalaircraftjust12feetlong.Itachieveshypersonicspeedusingaspecialsortofengineknownasascramjet3.Itmaysoundlikesomethingfromaicbook,butengineershavebeenexperimentingwithscramjetssincethe1960s.Foranenginetoburnfuelandproduceenergy,itnee

3、dsoxygen.Ajetengine,likethoseonpassengerairplanes,getsoxygenfromtheair.Arocketenginetypicallygoesfasterbuthastocarryitsownsupplyofoxygen.Ascramjetenginegoesasfastasarocket,butitdoesn‘thavetocarryitsownoxygensupply.Ascramjet"sspecialdesignallowsittoobtainoxygenfromtheairthatflowsthroughtheengine.

4、Anditdoessowithoutlettingthefast-movingairputoutthebustionflames.However,ascramjetengineworksproperlyonlyatspeedsgreaterthanfivetimesthespeedofsound.AboosterrocketcarriedtheHyper-Xtoanaltitudeofabout100,000feetforitstestflight.Theaircraft’srecord-beatingflightlastedjust11seconds.Althoughthelittl

5、eplane‘sself-poweredflightlastedonly11seconds,thatbriefjourneyonMarch27makesamajormilestoneonthewaytoanewbreedofveryfastairplanes,mentsWernerJ.A.DahmoftheUniversityofMichiganinAnnArbor4.Inthefuture,engineerspredict,airplanesequippedwithscramjetenginescouldtransportcargoquicklyandcheaplytothebrin

6、kofspace.Suchhypersonicjetscouldpotentiallycarrypassengersanywhereintheworldinjustafewhours.OutofthethreeexperimentalHyper-XaircraftsbuiltforNASA5,onlyoneisnowleft.Theagencyhasplansforanother11-secondhypersonicflight,thistimeat10timesthespeedofthesound.词汇hypersonic/7haipE（：）5sCnik/adj.超音速的booste

7、r/5bu：stE/n.助推器equator/i5kweitE（r）/n.赤道milestone/5mailstEun/n.里程碑unmanned/Qn5mAnd/adj.无人的boosterrocket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.TheHyper-Xbrokether