职称英语卫生类阅读判断专项检测试题2017年职称英语卫生类阅读判断专项检测试题我们一定要给自己提出这样的任务：第一，学习，第二是学习，第三还是学习。以下是小编为大家搜索整理的2017年职称英语卫生类阅读判断专项检测试题，希望对正在关注的您有所帮助!更多精彩内容请及时关注我们应届毕业生考试网!第一篇BlackHolesMostscientistsagreethatblackholesexistbutarenearlyimpossibletolocate.Ablackholeintheuniverseisnotasolidobject,likeaplanet,butitisshapedlikeasphere(球体).Astronomers(天文学家)thinkthatatthecenterofablackholethereisasinglepointinspacewithinfinite(无限的)density(稠密).Thissinglepointiscalledasingularity(奇点).Ifthesingularitytheoryiscorrect,itmeansthatwhenamassivestarcollapses,allthematerialinitdisappearsintothesingularity.Thecenterofablackholewouldnotreallybeaholeatall,butaninfinitelydensepoint.Anythingthatcrossestheblackholeispulledinbyitsgreatgravity.Althoughblackholesdoexist,theyaredifficulttoobserve.Thesearethereasons.•Nolightoranythingelsecomesoutofblackholes.Asaresult,theyareinvisibletoatelescope.•Inastronomicalterms,blackholesaretruly.Forexample,ablackholeformedbythecollapseofagiantstarwouldhaveaneventhorizon(视界)only18milesacross.•ThenearestblackholeswouldbedozensoflightyearsawayfromEarth.Onelightyearisabout6trillion(万亿)miles.Eventhemostpowerfultelescopescouldnotpickoutanobjectsosmallatsuchagreatdistance.In1994theHubbleSpaceTelescopeprovidedevidencethatblackholesexist.Therearestillanswerstobefound,however,soblackholesremainoneofthemysteriesoftheuniverse.1.Blackholesarepartofspace.A.RightB.WrongC.Notmentioned2.Blackholesexistbutaredifficulttoobserve.A.RightB.WrongC.Notmentioned3.Thecenterofablackholeisempty.A.RightB.WrongC.Notmentioned4.Theattractionoftwolargestarsleadstogravity.A.RightB.WrongC.Notmentioned5.Thesunistheheavieststarintheuniverse.A.RightB.WrongC.Notmentioned6.Thenearestblackholesarehundredsoflightyearsawayfromus.A.RightB.WrongC.Notmentioned7.TheHubbleSpaceTelescopehelpsscientiststounderstandthenatureoftheuniverse.A.RightB.WrongC.Notmentioned第二篇TheRaceintoSpaceAmericanmillionaireDennisTitowillalwaysbefamous.Hewasthefirsttouristinspace."Ispents